Structures of the eye and adnexa (cornea, lens, retina, optic nerve, eyelid) with their function, tested on the NBEO.
45 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the function of the corneal epithelium?
- Acts as a barrier against infection and forms a smooth optical surface with the tear film
- Which corneal layer lies directly beneath the epithelium?
- Bowman's layer
- What is the thickest layer of the cornea?
- The stroma
- What is Descemet's membrane?
- The basement membrane of the corneal endothelium
- What is the function of the corneal endothelium?
- It pumps fluid out of the stroma to keep the cornea deturgesced and clear
- Is the cornea vascularized?
- No, the cornea is avascular
- Which cranial nerve provides corneal sensation?
- Cranial nerve V1, the ophthalmic branch of the trigeminal nerve
- What is the approximate refractive power of the cornea?
- About 43 to 44 diopters
- The cornea and lens together provide about ____ diopters of total refractive power to the eye.
- 58-60
- What structure connects the lens to the ciliary body?
- Zonular fibers (zonules of Zinn)
- What happens to the lens shape during accommodation?
- It becomes more rounded, increasing its curvature to focus on near objects
- Does the lens have a direct blood supply?
- No, the lens is avascular
- What is the lens capsule?
- An elastic membrane that encloses the entire lens
- Where is the only epithelial cell layer of the lens located?
- Beneath the anterior capsule
- What is presbyopia?
- Age-related loss of accommodation caused by lens stiffening