Optics of vision bcqs


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Optics of vision bcqs

  1. 1. OPTICS OF EYEBCQs = 25TIME = 50minsMARKS = 50Dr Saadiayh RaoDepart of Physiology, DIMC
  2. 2. Light travels faster through:a. Airb. Liquidsc. Solidsd. Glasse. Water
  3. 3. Photo receptors are sensitive only towavelengths b/w:a. 100-300nmb. 300-800nmc. 400-700nmd. 600-900nme. 100-1000nm
  4. 4. Light with longest wavelengthis:a. Violetb. Bluec. Redd. Greene. Yellow
  5. 5. Most of refraction occurs at:a. Ant surface of corneab. Ant surface of lensc. Ant surface of retinad. Post surface of corneae. Post surface of lens
  6. 6. Refractive ability of which of thefollowing structure can be changed:a. Sclerab. Corneac. Irisd. Lense. Retina
  7. 7. The total refractive power of thereduced eye is:a. 80b. 75c. 69d. 59e. 49
  8. 8. Following statements are true abouteye muscles EXCEPT:a. Medial rectus is supplied by abducent nerveb. Lateral rectus is supplied by abducent nervec. Medial rectus is supplied by oculomotor nerved. Superior oblique is supplied by trochlear nervee. Inferior oblique causes elevation of eye
  9. 9. Sclera:a. Forms ant 1/3 of eyeballb. Is composed of dense connective tissuesc. Is highly vascular layerd. Does not protect eyeballe. Is pierced by ciliary artery
  10. 10. Cornea:a. Is a semi transparent layerb. Forms ant 1/3 of eyeballc. Is highly vascular layerd. Is nourished by lymphaticse. Protect eye from light entry
  11. 11. In Astigmatism, the curvature ofwhich of the following structure isuneven:a. Sclerab. Corneac. Irisd. Lense. Retina
  12. 12. Factor dilating pupil is:a. Near visionb. Emotionsc. Sleepd. Exposure to Lighte. Parasympathetic stimulation
  13. 13. Factor constricting pupil is:a. Distant visionb. Exposure to darkc. Emotionsd. Sleepe. Sympathetic stimulation
  14. 14. Lens:a. Is a transparent biconcave elastic structureb. Lies b/w iris & vitreous bodyc. Aqueous humor fills the cavity behind itd. Is highly vascular structuree. Has more refractive ability than cornea
  15. 15. Cataract:a. An opaque area in eye lensb. Occurs due to defective lipids in lensc. Treated by topical medicinesd. Occurs in old age onlye. Is due to increased amount of aqueous humor
  16. 16. Most of the aqueous humor is secreted by:a. Corneab. Lensc. Irisd. Choroid plexuse. Ciliary process
  17. 17. Aqueous humor is formed by the process of:a. Active secretionb. Osmosisc. Passive diffusiond. Facilitated diffusione. Bulk transport
  18. 18. Aqueous humor contains all of thefollowing EXCEPT:a. Waterb. Sodiumc. Fibrinogend. Hyaluronic acide. Ascorbic acid
  19. 19. Tonometry is a process of measuring:a. CSF pressure in ventriclesb. CSF pressure in spinal cordc. Blood pressure in heartd. Pleural pressuree. Intraocular pressure
  20. 20. Retina:a. Is thin delicate outer layer of eyeballb. Extends posteriorly to ciliary bodyc. Is organized in three layersd. Rods & cones are present in neural portione. Fovea is the region where optic nerve leave retina
  21. 21. Emmetropia:a. Is normal eyeb. Occurs in old agec. Corrected by cylindrical lensd. Corrected by concave lense. Corrected by convex lens
  22. 22. Presbyopia:a. Is more common in young ageb. Occurs due to increase in range of accommodationc. Occurs in old aged. Treated by cylindrical lense. Is normal eye
  23. 23. When the eye is accommodated fornear vision:a. Ciliary muscles relaxb. Pupil dilatec. Convergence of eyesd. Image of the object is focused in front of retinae. Image of the object is focused behind the retina
  24. 24. Stimulation of parasympatheticnerves to eye, causes:a. Relaxation of ciliary musclesb. Contraction of ciliary musclesc. Dilation of pupild. Accommodation of eye for far visione. Decrease in lens power
  25. 25. A myopic person:a. Needs bifocal lensb. Needs cylindrical lensc. Needs convex lensd. Is unable to see the far object clearlye. Is unable to see the near object clearly
  26. 26. The term hypermetropia means:a. Eyes with normal visionb. Difficulty in focusing near objectc. Difficulty in focusing far objectd. Failure of accommodation of eyese. Increased intra ocular pressure