OphthoBook-Questions – Anatomy

About 24 millimeters. Eyes that are myopic tend to be longer, while hyperopes have shorter eyes.

It drains tears into the nose, underneath the inferior turbinate.

The trochlea is a fibrous pulley at the superior medial wall of the eye socket (kind of near the bridge of the nose).

The extraocular muscles mostly originate at the annulus of Zinn, at the back of the eye socket.

There are actually 3 chambers in the eye – anterior chamber, posterior chamber, and vitreous chamber.

The orbicularis muscle closes the eye. The levator palpebrae opens the eye.

Tears go from lacrimal & accessory glands, over eye, through punctum, cannaliculi, lacrimal sac, nasolacrimal duct, then nose.

These bones are: 1-Maxillary 2-Frontal 3-Zygomatic 4-Ethmoidal 5-Lacrimal 6-Sphenoid 7-Palatine

The lens has three layers. The outer capsule, middle cortex, and the central nucleus.

The cornea has well-organized layers of collagen and is relatively dry. When the cornea gets too wet, it gets cloudy and turns white.

The cornea has five layers: epithelium, Bowman’s layer, stroma, Descemet’s membrane, endothelium

Starting from “inside” the eye and moving our way outwards: 1-Ganglion Nerves 2-Photoreceptors 3-Choroid 4-Sclera

The ciliary body is a band of muscle right behind the iris. It controls the lens shape and produces aqueous humor.

The uvea is comprised of three structures: the iris, ciliary body, and the choroid.