What are the three main layers or coats of the eyeball?

The eyeball wall has three concentric coats: outer fibrous coat (sclera and cornea), middle vascular coat (choroid, ciliary body, and iris), and inner nervous coat (retina).

What are the compartments inside the eyeball and what fills them?

The eyeball has two main compartments: anterior compartment (in front of the lens), filled with aqueous humour, and posterior compartment (behind the lens), filled with vitreous humour.

What is the function of the lens in the eye?

The lens is a transparent, biconvex structure that adjusts its curvature for accommodation, helping to focus light onto the retina.

How does the eye control the amount of light entering it?

The iris acts as a diaphragm with a central opening called the pupil. It contains muscles (constrictor and dilator pupillae) that adjust pupil size to regulate light entry.

What are the refractive media of the eye and their roles?

The refractive media include four transparent structures: cornea (major refractive surface), aqueous humour (maintains pressure and nourishes), lens (adjustable for accommodation), and vitreous humour (maintains eyeball shape and supports retina).

What is the difference between the anterior and posterior chambers of the eye?

Both are part of the anterior compartment: anterior chamber is between the cornea and iris, and posterior chamber is between the iris and lens. Both contain aqueous humour.

What common age-related condition affects the lens?

Presbyopia is an age-related hardening of the lens that reduces its ability to accommodate, leading to difficulty focusing on near objects.

Eyeball Anatomy – Coats, Chambers & Lens

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