Page 1 of 5: ophtahl: most important factor in determining convergence of

drsmita_s · Credits: 18690 My Scrapbook

most important factor in determining convergence of light rays on retina is :
1 physical state of vitreous
2 dioptre power of lens
3 curvature of cornea
4 length of eyeball

is it 3 or 4?

gandalf · Credits: 8395 My Scrapbook

I think it is 4) length of eyeball!!!

trinity · Credits: 13371 My Scrapbook

why do u think so gandalf? can u plz explain? why not 3?

BRAVO · Credits: 46105 My Scrapbook

it shud be curvarture of cornea!!!

drsmita_s · Credits: 18690 My Scrapbook

dr.Bravo, can u support your answer with a short reference
this is an old AIIMS ques and amit ashish give the answer as length of the eyeball , but i too feel that it shud b curvature of cornea. please help.

gandalf · Credits: 8395 My Scrapbook

How exactly do u people think, cornea is involved in the convergence of light?! There are a few conditions involving cornea, that affect the convergence..(or refractoriness)...I guess length of the eyeball is important, as it is not dynamic(not changeable) of its own....

drsmita_s · Credits: 18690 My Scrapbook

major part of ocular refraction takes place at the anterior corneal surface . optical power of cornea is +43 dioptres.

gandalf · Credits: 8395 My Scrapbook

that may be true, but anyway cornea/lens cannot converge the light rays on the retina,nor caan they be correcred to...!!!

decembermist · Credits: 41211 My Scrapbook

mudit khanna also gave ans as c)

drsmita_s · Credits: 18690 My Scrapbook

u r looking scary gandalf! ofcourse cornea and lens are responsible for converging light on the retina . what do u think excimer laser is for?

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