ABO advanced Mandatory Questions and Verified Answers 2024

Name the three tunics of the eyeball. - fibrous tunic, vascular tunic, nervous tunic What does the fibrous tunic consist of - cornea and sclera What does the vascular tunic consist of - choroid, ciliary body, iris What does the nervous tunic consist of - retina Name the three fluid filled chambers in the eye - Anterior chamber, posterior chamber, vitreous chamber What is the largest fluid filled chamber in the eye? - Vitreous Chamber What does the Canal of Schlemm do? - drains aqueous humor What is the first refractive body that light passes through on the eye - Tear film How many layers does the tear film have? Name them. - 3. Mucin/Mucoid layer, aqueous layer, lipid/oil layer What is the purpose of the mucin layer of the tear film? - Allows tears to adhere to the eye What is the purpose of the aqueous layer of the tear film? - Provides oxygen to the cornea, prevents infection, washes away particles. What is the purpose of the lipid layer of the tear film? - Seals tears, and prevents layers underneath from evaporating. What is the sclera of the eye? - white of the eye What is the purpose of the sclera? - Helps maintain shape of the eye and provides a protective membrane to help tears adhere to the eye. What is the cornea? - Outer transparent layer, bends/refracts light into the eye How many layers does the cornea have? Name them. - 5. Epithelium, bowman's Membrane, stroma, descements membrane, endothelium. What is the epithelium of the cornea? - Outermost layer, provides protection and is able to regenerate quickly. What is the bowman's membrane of the cornea? - Second outermost layer, main job is to provide protection. What is the stroma of the cornea? - The middle layer of the cornea. The thickest layer of the cornea, provides 90% of the corneal thickness. What is the descement's membrane of the cornea? - 4th deepest layer, it's a protective layer that can regenerate quickly. What is the Endothelium of the cornea? - Deepest layer of the cornea, acts as a pump to remove water and keep the cornea clear. How many muscles control the iris? Name them. - 2. Dilator and Sphincter How much is the iris able to change pupil size? - 2mm-8mm