What Part Of The Eye Focusses The Image On The Retina?

Eye is basic visionary organ in living organism that detects light. It is sensitive organ: comprise of small parts which control all its functioning, includes focusing lens and iris (regulation of light intensity and focusing it on retina), retina (detection and conversion of light in electric signals), optic nerve (transmission of electric signal to brain) and vitreous humour (regulation of light intensity). Eye is divided into two segments.
Front (anterior) segment comprise of cornea, iris, ciliary body and lens. To focus light on retina cornea and lens come into play and converge light for proper focusing. Convex lens is present behind the iris which focuses light on retina through second humour. Lens is attached to ciliary body through zonule of zinn (rings of suspensory ligaments). To see far away object, lens is flattened through relaxation of ciliary muscles which stretches the connecting fibres of lens. When these muscles contracts they retain lens to its original position (convex and round). Iris (fibrovascular tissue in form of pigmented ring) is present in between the lens and first humour, light first pass through this medium to pupil.
Back segment comprise of anterior hyaloid membrane, vitreous humour, retina, choroid and optic nerve. This segment pass light without being refraction, maintain the eye shape and suspension of lens.

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