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describe lens accommodation for near objects
1. the eye detects optical blur
2. cilliary muscles contract
3. zonular fibres loosen
4. lens becomes thicker for more refraction of light
describe lends accommodation for far objects
1. there is no retinal blur
2. cilliary muscles relax
3. zonular fibres contract
4. lens becomes thinner
what is the lens thickness of an unaccommodated lens
3.5-5 mm
what is the capsule of the lens made up of
made up of thickened basement membrane from the underlying anterior epithelium
it has collagen fibrils and glycosaminoglycans and it is acellular
what is the function of the capsule
1. it is permeable to water and small solutes and proteins
2. it acts as a reservoir for the build-up of molecules and growth factors that regulate the lens metabolic processes
where do zonule fibres originate from
pars plana and pars plicata of the ciliary body
what are zonules, what are they made up of and what is their function
they are microfibrils
they are made up of elastin and fibrilin
function- offer mechanical strength
capsule is secreted by
anterior epithelium
what cell junctions does the anterior epithelium of the lens have
desmosomes and gap junctions
what is the function of the anterior epithelium of the lens?
1. it secretes the capsule
2. it forms new lens fibres
3. active transport of ions and water for transparency takes place in the epithelium
4. it is metabolically active as it transports metabolites from the aqueous humour to the lens
what are the contents of lens fibres?
and what are they mainly made up of
1. water
2. insoluble proteins
3. soluble proteins they make up 80- 90%
what is the function of the lens in accommodation
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