QUESTION BANK FINAL

551 81.The normal AC depth is……………… Ans : 2.5mm to 3.5mm 82.A scan is a …………… method Ans : contact 83.The model cornea gel is …… ……. Ans :Liqyuasonic ultra sound gel 84. …………are the types of keratometer Ans : Von Helmholtz Keratometer, JavalSchiotzKeratometer 85. …………………are invented the refraction Ans :Nikolosmol 86. …………………….discovered cataract Ans :Susurthur 87. …………is the 4 circle of keratometer Ans :Catoptic image 88. Keratometer measures the refractive status of a very small central area of cornea------------------------ Ans : 3 to 4mm 89. CCT abbreviation is……… REFRACTION DEPARTMENT-CBE

552 Ans : Central Corneal Thickness 90. The value of k1=43.00, k2= 40.0 and 00000al=21.0 how is it used ……… Ans : SRK II formula 91.A-Scan biometry is also called ……..… Ans : axial length measurement 92. Keratometer used to measure the………… Ans : corneal curvature 93. Stony reflections also occurs as the sound beam encounters the posterior lens surface and the …………………….. Ans : retina 94. Axis passing through ………..to the fovea. Ans : corneal apex 95.4mm compression error can result in a ………. error in the calculated IOL power Ans : 1 Diopter 96. In A-scan biometry thin and parallel sound beam is emitted from the probe tip at given frequency of approximately…………… Ans : 10MH 97. Biometric information is fed into variety of formula to calculate two types…………..

553 Ans : Theoretical formula, Regression formula 98. Theoretical formula based on 3 variables, the…………………. Ans : Axial length of the eye ball, Keratometry reading, The estimated post- operative AC depth 99. Binkhrost formula ………………… Ans : P = 1336(4r-d)(a-d)4r-d) 100. SRK II formula is………………….. Ans : P = A-2.5l- 0.9K 101. SRK expansion …………………….. Ans : Sanders Ratleff Kraft 102. Other name of Keratometry is…………………. Ans : Ophthalmometry 103. Keratometry is also helpful in determining the appropriate fitting of ……… Ans : Contact lens 104. Keratometry determines ………. by measuring the size of the reflected …………….. Ans : corneal curvature mire. 105. The radius scale is determined and diopter scale is derived from the radius the formula for surface power…………… REFRACTION DEPARTMENT-CBE

554 Ans : D = (n-1),(n = 1.3375 standardized refractive index of the cornea 106. When an object is in front of the cornea a virtual image is seen inside the…………… Ans : Convex mirror 107. Velocity of sound in cornea is ……………… Ans : 1640m/s 108. Velocity of sound in Aqueous is ………….. Ans : 1532m/s 109. Velocity of sound in normal lens is …………… 110. Velocity of sound in cataractous lens is …………… Ans : 1640m/s 111. Velocity of sound in vitreous is ………………….. Ans : 1629m/s 112. Company name of the Pac-Scan machine ……… Ans : 1532m/s 113. Company name of the Keratometry ……… Ans :Sonomed Ans :Baush&Lomp

555 114. The start base curve of K reading is--------------- Ans : 6.4 to 9.4 115. The Velocity of the aphakia eye is------------------------ Ans : 1532 m/s 116. The name of the Pac scan company ---------------------- Ans :sonomed 117. The velocity of the pseudophakic eye is ----------------- Ans : 1532m/s 118. The velocity of the cataract eye is---------------- Ans : 1629m/s 119. The probe light rays name is ------------- Ans :Dio crystal electro waves 120.Thename of the Ascan spike is-------------- 121. The uses of Ascan ----------. --------. Ans : IOL calculation ,AXL measurement 122 .Against rule Astigmatism example -------------- Ans : 45 x 43 180 axis REFRACTION DEPARTMENT-CBE

556 123. ----------------the invented IOL Ans : Sir Harold Rudely 124.With rule Astigmatism example------------- Ans : 43 x 45 90 º axis 125. ----------------astigmatism is there in pterygium patient Ans : Against rule 126. --------------, ---------------. -------------is types of IOL Ans :Monofocal, Multifocal, Trifocal 127. The model cornea gel is used to ------------ Ans : checked calibration 128. --------------, ----------------is the type of keratometer Ans : Automated, Handheld, and Manual 129. -------------is the 4 circle of keratometer Ans : mires 130. In Ascan formula L is the--------------------- Ans : Axial length 131. SRK II formula P= ------------------- Ans : A-(2.5L-0.9K)

557 132. Optical axis of the eye is distance from ---------------- Ans : corneal apex to fovea 133. Corneal compression caused by excessive pressure from the probe will cause - -----------axial length Ans : short 134. The standard deviation is ------------------ Ans : below 0.04mm 135. The range of Keratometer base curve value------------------ to ------------ Ans : 6.4mm, 9.4mm 136. First sensation of the object ---------- Ans : [cornea] 137. Megalocornea ,keratometer value will be -------------------- Ans : High 138 .Micro cornea ,Keratometer value will be 7 ----------------- Ans : Low 139.Range of Keratometer diopter value------- Ans : 36 to 52 Diopers REFRACTION DEPARTMENT-CBE

558 IV.TRUE OR FALSE : 1.Ultrasonography detects tumours&determining the their size of the eye Ans : True 2.Ultra sound procedure are divided into three types Ans : False 3.Amplitude scan is a one dimensional display Ans : True 4.Axial length only needed to detect IOL power Ans : False 5.The optical axis of the eye is distance from the corneal apex of the choroid Ans : False 6.Ultra sound travels at different speeds through materials of same densities Ans : False 7.The artificial shortening of the axial eye length is a potential source of significant error Ans : True 8.Keratometer measure the central 6mm of the corneal diameter

559 Ans : False 9.Normal axial length 25.33mm Ans : False 10.Regression formula of IOL calculation is based upon the patient’s old glass prescription Ans : False 11.SRK-T formula is considered to be most accurate for the eyes between 24.00mm to 28.00mm long Ans : True 12.The image formed by the keratometer on the cornea are based on the principle of purkinge same on image Ans : True 13.Headaches in the frontal area is due to convergence deficiency Ans : True 14.Frequency of approximately toric IOL is preferred for patients with corneal astigmatism Ans : True 15.SRK–formula is a theoretical formula.- REFRACTION DEPARTMENT-CBE

560 Ans : False 16.Susurthur discovered cataract Ans : True 17.Herold Redly the invented pal Ans : False 18.Ascanechos; probe, anterior surface of the cornea, posterior surface of the cornea, anterior surface of the lens, posterior surface of the lens, retinal echos, orbit echos Ans : True 19.Below 36 is the keratometer reading of megalocornea Ans : True 20.With the rule astigmatism is there in pterygium patient Ans : False 21.Varifocal, single vision, bifocal aretypes of IOL Ans : False 22. Nikolaos mol is invented the contactlens Ans : False 23.Von helmholtzkeratometer, Javalschoiotzkeratometer are the types of keratometer

561 Ans : True V. MATCH THE FOLLOWING : 1. A-scan - Axial length IOL power 2. A-scan formula - A-scan Cornea to retina 3. Sound beam - A-scan probe Purkinje image 4. Optical axis - Keratometry Iol power 5. Corneal compression - Keratometer Convex mirror 6. Keratometry - Diopter scale Short eye 7. Corneal curvature - Measurement Mire 8 Binkhost formula - 118.5 9. Doubling prism - 10. Cornea - 11. Radius scale - 12. Axial length - 13. Radius - 14. Keratometry reflection - 15. ‘A’ constant - VI .UNSCRAMBLE : - POTENTIAL - COMPRESSION 1. OETAPTNIL - SIGNIFICANT 2. CMRSINOSEPO - MATERIALS 3. INFCNTAIIGS - VITREOUS 4. MTRASLIEA 5. IROSVTEU REFRACTION DEPARTMENT-CBE

562 6. SRCUETUTR - STRUCTURE 7. HOETCLTERIA - THEORETICAL 8. CLUAEACLT - CALCULATE 9. TIATNASMAO - ESTIMATION 10. ERSINRGESO - REGRESSION 11. INORTBKHS - BINKHORST 12. UKNEPRIJ - PURKINJE 13 URATECVAR - CURVATURE 14. TADADIEDSNRZ - STANDARDIZED 15. PRBLMOSE - PROBLEMS 16. ADITONLDIA - ADDITIONAL 17. ORZOTALNIH - HORIZONTAL 18. UBICTIGLRAN - LUBRICATING 19. GYTLUARROOSNPHA - ULTRASONOGRAPHY 20. IXLAL - AXIAL 21. OTPTIRE - DIOPTER 22. SDLUONUADR - ULTRASOUND VII. TWO MARK QUESTIONS : Page no : 86 ( Manual ) 1.Write about the A-scan 2.How many types of ultrasonography?

563 Page no : 86 ( Manual ) 3.Write about the reflectivity Page no : 86 ( Manual ) 4.What is optical axis? Page no : 86 ( Manual ) 5.Write about the complication of corneal compression? Page no : 86( Manual ) 6.Write about the speed of ultrasound through the structure of the eye Page no : 87 ( Manual ) 7.Define the a-scan spike Page no : 87 ( Manual ) 8.How many formulas used in a-scan? Page no : 87 ( Manual ) 9.What is the use of keratometer? Page no : 88 ( Manual ) 10.Principle of the keratometry? Page no : 88 ( Manual ) REFRACTION DEPARTMENT-CBE

564 11.Principle of IOL master? Page no : 86 ( Manual ) 12.The value of k1=43.00, k2=40.00 and al=21.0 how is it used in SRK ii formula? Page no : 86 13.The Rx= -2.50ds, Rt= -1.0ds and p=+24.0ds how is it used wrong IOL calculation? Page no : 86 14.The silicon oil injection all is 30.50mm how is it used to SRK ii formula what is IOL power? Page no : 86 15. The pre k is k1=40.50, k2=42.50 and post k (k1=39.0ds, k2=41.0ds) what is used post lasik IOL calculation? Page no : 86 VIII. FIVE MARK QUESTIONS : 1.Explain about the amplitude of scan Page no : 86 ( Manual ) 2.How to calculate the IOL power with biometry &formula

565 Page no : 87 ( Manual ) 3.Explain about the keratometry Page no : 88 ( Manual ) 4.Write about the step-by-step procedure in keratometry Page no : 89 ( Manual ) 5. How to recording the keratometry measurement Page no : 89 ( Manual ) 6. Given +1.0 d sph / +2.0 d cyl x 180 (+6 base), give the base curve, spherical surface ,Power, cylindrical surface power, and the final prescription using toric transposition Page no : 105 ( Manual ) 7. Explain documentation of retinoscope values for the following diagnosis. LE – Myopia, RE – compound myopic astigmatism BE – Mixed astigmatism LE – Simple hypermetropia astigmatism (axis 105°), RE – Hypermetropia BE – High Myopia BE- Presbyopia, different powers Page no : 105 ( Manual ) REFRACTION DEPARTMENT-CBE

566 8. Given +1.0 d sph / +2.0 d cyl x 180⁰(+6 base), give the base curve, spherical surface power, Cylindrical surface power and the final prescription using toric transposition Page no : 105 ( Manual ) IX. JUMPING WORD: 1. U-TR- -ONO- -AP-- - ULTRASONOGRAPHY 2. E- -O-S - ECHOES 3. D- -EN- -ON-L - DIMENSIONAL 4. .-P-K- - SPIKE 5. A- -LI- -D- - AMPLITUDE 6. B- -ME- -Y - BIOMETRY 7. A- -A- - AXIAL 8. A- -A-L- -GT- - AXIAL LENGTH 9. .-EA- -RE- -NT - MEASUREMENT 10. K- - -TOM- -RY - KERATOMETRY 11. .-OW- - - POWER 12. I- -RA- -U-A- - - INTRAOCULAR 13. .-E-S - LENS 14 C- -A- -C- - CATARACT 15. .-U- -ER- - SURGERY 16. .-EF- -CT- -IT- - REFLECTIVITY 17. P- -B- - PROBE 18. S- -N-B- -M - SOUNDBEAM 19 P- -K- - - PHAKIC 20. A- -EO- - - AQUEOUS

567 21. .-N- - RI- - - - ANTERIOR 22. S- -F-C-E - SURFACE 23. .-ET- -A - RETINA 24. C- -N- - - CORNEA 25. O- -IC-LA-I- - OPTICAL AXIS 26. A- -X - APEX 27. .-O- -A - FOVEA 28. C-M-RE- -IO- - COMPRESSION 29. P-E- -U-E - PRESSURE 30. A-T- -I-I-L - ARTIFICIAL 31. E- -O- - ERROR 32. V-L- -IT- - VELOCITY 33. P-R-L- -L - PARALLEL 34. A- -RO-I-A-EL- - APPROXIMATELY 35. C- -R- -D - CHOROID 36. O- -I- -L - ORBITAL 37. D- -P- -R - DIOPTER 38. S- -U-TU- -S - STRUCTURES 39. -HE- -ETI- -L - THEORETICAL 40. -E- - -SS-ON - REGRESSION 41. F-R- -LA- - FORMULAE 42. G- -ME- -ICO- -IC- - GEOMETRICOPTICS 43. E- -E-R- -IA - EMMETROPIA 44. B- -K-O- -T - BINKHORST 45. -O-I- -CA- -O- - MODIFICATION 46. - -RA- -MET-R - - KERATOMETRY REFRACTION DEPARTMENT-CBE

568 - SANDERS - RETZLAFF 47. SAN- -RS - KRAFT 48. - -TZ- -F- 49. K- -F- X.ENGLISH TO TAMIL : 1. Amplitude - ைசீ ்சு 2. Axial Length - அச்சுநீளம் 3. Velocity - கைகம் 4. Compression - சுருக்கம் 5. Curvature - ைவளவுஆரம் 6. Ultra sound - தீைிரஒலி 7. Standard - நிவலயாை 8. Depth - ஆழம் Potential - சாத்தியமாைமூலம் 10 source - ககாட்பாடு 11. Theoretical - பின்ைவைவு 12. Regressions - அடிக்கடி 13. Frequency XI. GIVE THE REASONS: 1. Why we using contact method for Pseudoahakicpatient ? Ans : While we seeing in Immersion method , lens may be subluxation or dislocation. 2. Myopic patients have high axial length . Why ?

569 Ans : Eye ball is longer 3. Why we correcting the eye piece before seeing the K-reading . Ans : To avoid error XII. CORRECT SENTENCE : 1. A 4mm compression error can result in a 3 diopter error in the calculated IOL power . Ans : 1D 2. The spike of an echo is indicated by the amplitude of the spike Ans :Stength 3. The optical axis of the eye is the distance from the corneal apex to the macula . Ans : Fovea 4. It is a one dimensional display , where echoes are depicted as Horizontal deflection from the baseline. Ans : Vertical 5. The Ascan probe must come into contact with the Retina either directly . Ans :Cornra Work sheet 1.How to select IOL power for children? REFRACTION DEPARTMENT-CBE

570 2.The adult axial length is reached about how many years after the baby is born ? 3.Name of probe is……….. 4. In a short eye ball patient increase of 1mm axial length will be lead to a …. Power change. 5. In a long eye ball patient increase of 1mm axial length will be lead to a …. Power change. 6. ……….. formula seems to be significantly more accurate for extremely 7.Hoffer –Q formula ………….

571 8.What is piggy back lens ? 9.AAL expansion…… 10.TAL expansion …… 11.PACD expansion …….. REFRACTION DEPARTMENT-CBE

572 CHAPTER - 11 CONTACT LENS

573 CHAPTER - 11 CONTACT LENS CONTENTS: History Types and materials Advantage and disadvantage Fitting procedure Handling method REFRACTION DEPARTMENT-CBE

574 Care and maintenance Complications I. ABBREVATION: 1. PMMA - Poly Methyl Metha Acrylate 2. HEMA - Hydroxy Ethyl Metha Acrylate 3.CAB - Cellulose Acetate Butyrate 4.BC - Base Curve 5.HVID - Horizontal Visible Iris Diameter 6.RGP - Rigid Gas Permeable II. CHOOSE THE BEST ANSWER : 1.Contraindication for contact lens use is …… A]Albinism B]Nystagmus C]dry eyes Ans : C]Dry eyes 2.Soft contact lenses are fitted larger than ........ diameter for A]Sclera B] Cornea C] a,b Ans : B] Cornea

575 3.Soft contact lenses are made up of ……....... material A] hydrophobic B]hydrophilic C]gas permeable Ans : B]Hydrophilic 4.Myopia can be corrected by ............... A] base in prism B]contact lens C]retina laser Ans : B]Contact lens 5.Contact lenses used for pthisical eye are called ............. A]prosthetic lenses B]special lenses C]therapeutic lenses Ans : A]Prosthetic lenses 6.Give an example of orthoptic use of lens --------- A]Amblyopia B]albinism C]myopia Ans : A]Amblyopia 7.Soft lenses are made up of --------materials A]silicone B]butylstyrene C]cellulose acetyl butyrate Ans : A]Silicone 8. ------patient should not use contact lens REFRACTION DEPARTMENT-CBE

576 A]bullous keratopathy B]amblyopia C]Ptosis Ans : A]Bullous keratopathy 9.The power of a contact lens for myopia is ………..than that of spectacle A]Equal to B]More than C]Less than Ans : C]Less than III. FILL IN THE BLANKS : 1.......is smallest,leastvisible for correcting refractive error Ans : Contact lens 2. Contact lens to correct the ............ Ans : refractive error 3. A majority of people use contact lens For ........ Ans : Cosmetic Purposes 4. Contactlens Inventor ......... Ans : Leonardo Da vinci 5.......... Produced an unique contact lens to correct Keratoconus Ans : Zeis 6.William Fein bloom an American used plastic …........

577 Ans : Corneal Contact Lens 7. Trial lens author .......... Ans : 1929 Heine 8.Soft contact lens which is madeup of …. ...... Ans : Hydrophilic material 9. Advantage of Contact lens ...... Ans : good cosmetic appearance 10.Myopia is ......... indication of contact lens use Ans : optical 11.Aniseikonia is ........ indication of contact lens use Ans : orthoptic uses 12.Albinism is ..... indication of contact lens use Ans : special uses 13.Bullous keratopathy is ....... Ans : Therapeutic indication 14.Pthisical eye is the ........ indication Ans : prosthetic uses 15.Dry eye is the ...... REFRACTION DEPARTMENT-CBE

578 Ans : contra indication 16.Soft contact lens are ........ contact lens Ans : flexible 17.Soft contact lens are made up ...... Ans : Hema 18.Soft contact lens are more comfortable than rigid lens because of their soft qualities and their ability to ..... Ans : flex on blinking 19.Advantage of soft contact lens ...... Ans : less glare and photophobia 20.Semi soft contact lens are ....... lens Ans : gas permeable 21.Semi soft contact lens are made of .............. Ans : oxygen , carbondioxide 22.Material of semi soft contact lens ....... Ans : Cellulose Acetyl Butyrate

579 23.Advantage semi soft contact lens ...... Ans : longer wearing time 24.Hard contact lens is made up ...... Ans : PMMA 25.Hard lens provides oxygen only by means of the .... Ans : tear push up 26.Stages of Fitting producers ....... Ans : 5 27.Normal keratometer value ........ Ans : 44.0 d to 45.0 d 28.HVID ........ Ans : Horizontal Visible Iris Diopter 29.How many steps of insertion and removal for soft contact lens..... Ans : 12 30.Remove the lens for cleaning and........ Ans : sterilizing 31.Hold the upper lid by the index finger and the lower lid by the middle finger...... technique REFRACTION DEPARTMENT-CBE

580 Ans : Scissor 32.Care and maintence can prevent potentials sight........ infections Ans : destroying 33.Low add for near vision means ……& high add for near vision means ……… Ans : below +1.75ds , above+1.75ds 34.Multifocal lens near vision lens available in……… Ans : low add,high add 35.After cleaning the lens should be...... Ans : rinsed 36.The rinsing procedure helps to remove the loosened........ and some microorganisms. Ans : deposits 37.Disinfecting storageare....... types Ans : two 38.Thermal disinfection should be placed in the case with....... Ans : saline solution 39.The lens heated to.... degree for ... minutes

40. ........ based solutions are used for disinfection 581 41.This is reasonably effective within....... minute Ans : 70 -80, 10 – 20 Ans : Hydrogen peroxide Ans : 10 – 15 minute 42.These disinfecting solution are also used for Ans : storage 43.Hypoxic related problems such as....... Ans : corneal edema, SPK 44.Allergic related problems include..... Ans : Hyperemia 45.Care andmaintence......... steps Ans : 15 46. …...... was first conceived by Leonardo de Vinci Ans : Contact lens 47.............permit oxygen to diffuse in and co2 to diffuse out Ans : Gas permeable lens 48.In keratometry, the cornea acts as a …............ REFRACTION DEPARTMENT-CBE

582 Ans : convex mirror 49.For corneal protection after surgery............can be used Ans : contact lens 50.Soft contact lenses are fitted larger than the corneal diameter to maintain good ………and ……… Ans : centration, stability 51.Silicon acrylate is used for making …........contact lenses Ans : semi-soft 52.Diameter of soft contact lens should be......... more than the limbus. Ans : 1.5mm 53.Group 4 type of lens is ………. Ans : High water & ionic (accvue lenses) 54.Semi soft contact lens is called............... Ans : gas permeable lens 55.Irregular astigmatism can be corrected by..................... Ans : contact lens 56.Contact lens invented by………. in 1508

583 Ans : Leonardo Da Vinci 57.The first plastic corneal contact lens was introduced in 1947 by ……… Ans : Kevin Touhy 58.Group3type of lens is ……low water & ionic Ans : pure vision 59.Types of contact lens are ... Ans : soft hydro gels, gas permeable lens (RGP), and hard contact lens 60.Material of soft contact lens is……… Ans : Hydraxy Ethyl Metha Acrylate 61.Advantage of soft contact lens is ……… Ans : less glare and less photophobia 62.Other name of semi soft contact lens is ……….. Ans : Rigid Gas Permeable 63.Material of semi soft contact lens is……… Ans : Cellulose Acetyl Butyrate 64.Gas permeable lens in a spherical form can correct……… Ans : up to 5 diopters of astigmatism 65.Hard contact lens is made up of……… REFRACTION DEPARTMENT-CBE

584 Ans : Poly Methyl Metha Acrylate 66. ……….. of hard contact lens is almost nil. Ans : Oxygen permeability 67.Fitting steps …….. Ans : keratometry value, corneal diameter, power, base curve 68. Minus lenses become ………. minus when changed from spectacle to contact lens. Ans : less 69.Plus lens become ……….plus when changed from spectacle to contact lens. Ans : more 70.Main types of soft contact lens are ………. Ans : optical, therapeutic, and cosmetic 71.Soft contact lens correct……….of astigmatism. Ans : small amount 72. ....... of water content is the low water content. Ans : less than 50% 73. ………of water content is the high water content. Ans : more than 50% 74. …..….. can correct by RGP lens.

585 Ans : keratoconus and irregular astigmatism 75.Advantages of contact lens are……… Ans : magnification, decreased peripheral & chromatic aberration, increase the size of visual field 76.Indications of the contact lens is ……… Ans : optical, orthoptic, special uses, therapeutic,prosthetic, surgical 77.Contraindication of contact lens is ……… Ans : dry eye, uncontrolled diabetic, pterygium 78.Advantages of soft contact lens are ………… Ans : comfortable, long time use, less glare,photophobia 79. Group 2 type of lens is …….… Ans : high water & non ionic (sl 59,sl 66) 80...............described a method of fitting contact lens since1929 Ans : Heine 81. ................produced a fitting set of contact lens for used to correct Ans : keretoconus since 1920 82.The Rohm and Hass company introduced …......... REFRACTION DEPARTMENT-CBE

586 Ans : Transparent methyl methacrylate 83.The first plastic corneal contact lens was invented by …....since 1947 Ans : Kevin Touhy 84.Group 1 type of lens is……… Ans : Low water & non ionic (optima 38,traditional) 85.The advantage of contact lens is decreased......... Ans : Peripheral and Chromatic aberrations 86.The indication of the contact optical uses for to treat ….... , …........ Ans : Hypermetropia,Myopia 87.Special indication of contact lens is to correct........, ….......... Ans : Aniridia,Albinism 88.Therapeutic uses of contact lens is......... , …....... , …............. Ans : Bullous keratopathy,Corneal ulcer 89. After refractive surgery contact lens is used for ....... Ans : Corneal protection 90.Prosthetic uses of contact lens.........., …........ Ans : Pthysical eye , Coneal opacity 91.Contra indication of contact lens..........................

587 Ans : Dry eye,lid problems,Blepharitis 92.There is ....... type of lens Ans : 3 93..................is flexible contact lens composed of either hydrogel or silicon material Ans : Soft Contact lens 94.Soft contact lens made of ….............. Ans : HEMA 95.Semi soft contact lens is called also ….................. Ans : Plastic 97.Semi soft contact lens is made up of................. Ans : CAB,Silicon acrylate 98.Hard contact lens is made up of...................... Ans : PMMA 99.Hard contact lens is called also............. Ans : non gas permeable 100.RGP abbreviation …................. REFRACTION DEPARTMENT-CBE

588 Ans : Rigid gas permeable 101.Types of FDA group classification……… Ans : Group 1, Group 2, Group3& Group 4 102. ................aberration is there in plus lens Ans : Chromatic lens 103.Multifocal contact lens having two dimensional vision is............... Ans : Distance,near 104.The types of prosthetic lens is................... Ans : 4 105. ........................is the types of “d” grade contact lens Ans : Prosthetic 106.Full of brown colour, centre plane is the types of..............grade contact lens Ans : Type C 107.“B” grade contact lens is …................. Ans : Therapeutic lens 108.....................grade contact lens is full of black colour Ans : Type D

589 109.The treatment of corneal ulcer is................... Ans : Bandage contact lens 110. …...........contact lens is used RP patient & colour deficiency patient Ans : X-Chrome colour 111. ….....................lens is the tri curve lens Ans : Rose K 112.Rose k lens is used for …............... Ans : Keratoconus 113.Colour contact lens can be used in which patient ..... Ans : Phtisical , Corneal opacity 114. BCL abbreviation is …............... Ans : Bandage contact lens 115. …..........used for glaucoma, corneal ulcer patient Ans : BCL 116.Who invented contact lens & which year ................... Ans : Leonardo Da Vinci 1508 117.HEMA expansion.................... REFRACTION DEPARTMENT-CBE

590 Ans : Hydroxy Ethyl Metha Acrylate 118.Which materials used in semi soft lens........... Ans : Cellulose Acetyle Butyrate 119.Contact lens is a…............................. Ans : thin plastic paper 120.Hard lens wearing time.......................... Ans : 8 hours per day 121.Soft lens to correct …..................astigmatism. Ans : below 1.00cyl 122.Disposable introduced in …...............year. Ans : 1987 123.Types of toric contact lens.................. Ans : front ,back ,bi toric 124.What is piggy pack method &which patient advised piggy pack lens............ Ans : soft over semi soft&keratoconus patient over irritation complaint 125.What is multifocal lens...................... Ans : Distance , Intermediate & Near Vision 126.Monthly disposable contact lens cost.....................

591 Ans : 845/-for 41/2 months 127.PHMB……… Ans : Poly Hexa Methyl Bigumid 128.Which patient used semi soft lens............... Ans : keratoconus &above 3.00cyl 129.RGP expansion.................... Ans : Rigid Gas Permeable 130.Soft lens fitting steep K ................. Ans : add 0.8mm 131.GPC expansion.................... Ans : Giant Papillary Conjunctivitis 132.BCL expansion................. Ans : Bandaged Contact Lens 133.Colour vision deficiency patient advised …..............lens Ans : x chrome lens 134.Which lens used corneal opacity pt................ Ans : prosthetic lens 135.Rose k lens make......................curved REFRACTION DEPARTMENT-CBE

592 Ans : Tri 136.Who invented soft contact lens ……… Ans : Otto Wichterle 137.Which instruments is used to measure corneal curvature……. Ans : keratometer 138.Types of contact lens ……… Ans : Soft, Semi Soft, Hard 139.What is HVID ………. Ans : Horizontal Visible Iris Diameter 140.Expand HEMA…….. Ans : Hydroxyl Ethyl Metha Acrylate 141.Which types of manufacturing methods reduced thickness……… Ans : Spin casting 142.Hard lens material …….. Ans : PMMA-Poly Methyl Metha Acrylate 143.-6.00/-2.00*180 spherical equivalent is ………. Ans : -7.00 ds 144.Expand BCL………..

593 Ans : Bandage Contact Lens 145.Manufacturing methods ……… Ans : Lath Cutting ,Spin Easting,Cast Moulding 146.Which lens we will give in astigmatism patient…… Ans : toric 147.Thermal disinfection is heated…… Celsius Ans : . 70-80 degree 148.Expand CAB-…….. 149.Soft lens adaptation time ……… Ans : Cellulose Acetyl Butyrate 150.Semi soft contact lens adaptation…….. Ans : 10-15 minutes 151.Soft lens wearing time……… Ans : 30 minutes Ans : 10-15 hours 152.Soft lens material ……… Ans : Hema 153.Semi soft lens given by…….. REFRACTION DEPARTMENT-CBE

594 Ans : keratoconus 154.Which lens we will give in presbyopia patient …… Ans : Multifocal, Bifocal 155.Corneal CL material ……… Ans : PMMA 156.Which patients we will give prosthetic cl corneal …….. Ans : opacity, leucoma 157. ……… developed first corneal cl Ans : 1948-kevin touchy 158.Which are the most common deposits found in soft contact lens …… Ans : protein, lipid 159.What is the character having soft contact lens ………. Ans : good flexible 160.Conventional lens……… Ans : Material Hydroxy Ethyl Metha Acrylate, Poly Macon 161.Conventional lenses wearing schedule ………. Ans : 10 to 12 hours / day 162.Conventional lens power available in ………

595 Ans : (±0.50 to ±30.00 ds) 163.Conventional lens complications …….. Ans : SPK,keratitis 164.Problems of conventional lens ……. Ans : more deposit 165.Disposable lenses launched in……….. Ans : 1987 ,1 to 2 weeks 165. Hydranate material minimizes ……over contact lens Ans : less protine deposite 167.Daily disposable lenses launched in ……… Ans : 1990 168.Disadvantages of monthly disposable lenses.................... Ans : up to -15.00ds&-2.75dcyl 169.Disposable means ……… Ans : use & throw lenses 170.SCL expansion………. Ans : Scleral Contact Lens 171.Fitting procedure……….. REFRACTION DEPARTMENT-CBE

596 Ans : corneal coverage , centration,lensmovement, comfort, vision 172.Who is describe the concept of contact lens …… Ans : Leonardo Da Vinci 173.Steep fit is…….. Ans : vision clears after blink 174.Flat fit is ………. Ans : vision blurs after blink 175.…… is power changes gradual from center to edge of the optic zone Ans : Multifocal contact lens 175.Extended wear contact lens uses ………… Ans : excellent oxygen permeability,bandage contact lens theraphy 176. Contact lens uses ………. Ans : cosmetic ,sportic activities therapeutic uses 177.Hard CL material……….. Ans : Poly Methyl Metha Acrylate 178.Semi soft CL material…….. Ans : Cellulose Acetyl Butyrate Fluro Silicon 179. Soft CL material…….

597 Ans : Hydroxy Ethyl Metha Acrylate Silicon Polymers 180. ……..are the most popular type of cl used now a days Ans : Soft contact lenses 181.Advantages of soft cl………. Ans : better vision ,good comfort, easier to fit,suitable for most of the patients 182.Contact lens Diameter should be selected ….. more than corneal diameter 183.SE expansion …… Ans : 1.00 to 2.00mm 184.Soft lens base curve add …… in average Ans : Spherical Equivalent Ans : 1.00mm 185.K-reading or add……..with flatter k-reading in RGP lens Ans : 0.2mm 186.RGP lens good oxygen permeability than…….. Ans : soft lens 187.RGP lens used in special corneal condition like…….. Ans : keratoconus high &irregular astigmatism 188.RGP lenses advantages ………… REFRACTION DEPARTMENT-CBE

598 Ans : increased comfort,excellent long term comfort,reduced corneal edema,spectacle blur &over wear syndrome 189.The base curve of the initial lens should be slightly steeper than the flattest meridian ………lens Ans : RGP 190.Contact lens advantages…….. Ans : field of vision is good,decreased abberations ,no diplopia 191.Contact lens special uses ………… Ans : Nystagmus,Albinism,Aniridia 192.Contact lens optical indications ……… Ans Hypermetropia,Myopia,Aphakia,Astigmatism,Keratoconus,Presbyopia 193.Contact lens orthoptic uses…….. anisekonia,anisometropia,amblopia Ans : occlusion 194.Contact lens therapeutic uses ……… Ans : Bullous Keratopathy,Corneal ulcer 195.Contact lens advantages…….. Ans : less glare & photophobia 196.RGP permeability of ……..than the other lens

599 Ans : Oxygen more 197.Contact lens should be changed in ……….wear contact lens Ans : daily 198.If the lens is not used daily solution should be changed once in……… Ans : two days 199.The lens should not be kept with out solution because it will get………… Ans : dried &the lens will be ruined 200.Multifocal cl available power…… Ans : +0.50to+6.00ds&-0.50-9.00 ds 201.While wearing the lens avoid sitting under the………. Ans : fan orwindy places 202.While traveling………. should be worn over contact lens Ans : plain glass or sun glass 203.The lens case should be washed……….. weekly &should be changed ……… Ans : once in three months 204.Contact lens complications allergic related problems include ………… Ans : Hypermia , Sterile Infiltrates &Giant Papillary Conjunctivitis 205.Types of prosthetic contact lens ………… REFRACTION DEPARTMENT-CBE

600 Ans : Type – A ,Type- B ,Type – C ,Type -D 206.……… lens are used to correct myopia Ans : Ortho k lens 207.Keratoconus best option ………. Ans : semi soft contact lenses 208.Keratoconus advanced treatment ……… contact lens Ans : Rose K 209.Toric contact lens is made by ……… Ans : Prism ballast 210.Polaxamine material minimizes …… over contact lens Ans : less lipid deposits 211.TBE expansion – ……. Ans : Tetra Butyl hydoxy cyclo hexyl methyl methacrylate 212.Taco test means ……… Ans : correct position checking method 213.Soft lens solution available in …………. Ans : Renu Multi Plus, Renu Sensitive,Bio True,Complete 214. Renu multiplus contain ………..