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Eye lens, Biology
In lumen of eye ball, a large colourless, transparent, more convex on back side, lens present covered by lens capsule.
When white tissues are formed in it, it becomes less transparent. So
Refrective index of lens is 1.42.
In lens yellow pigment present to check harmful sun rays.
Lens is fixed in position.
From cilliary body suspensory ligaments or
zonulla of zinn
are given out to keep lens in fixed position.
On relaxing of suspensory ligaments, focal length of lens is reduced.
Lens divides lumen into 2 unequal chambers.
Anterior small aquous chamber & posterior large vitrous chamber.
Aqueous chamber is filled by aquous humour (watery fluid).
Vitrous chamber is filled by vitrous wharton's jelly humour (formed during development in embryo only once).
Vitreous humour is dense contains 99% H O, remaining 1% vitrein protein, hyalorunic acid & collagen fibres.
s humour maintains shape of eye ball by turger pressure.
Around vitrous humour hyloid layer present.
In retina a blind spot present where no rods & cones are present.
In vitrous humour upto blind spot a hyloid canal is present.
Intralocular pressure (pressure of aquous + vitrous humour) is about 20 - 25 mmHg. optical axis touches retina to a point or area i.e
yellow spot or macula lutea
. Here xanthophill pigment is present.
Its central part is
Here only cones are obliquely placed so enlarged image is formed.
Posted Date: 10/3/2012 4:20:14 AM | Location : United States
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