ABO Exam Preparation (Leonardo Program)fully solved

bulbar conjunctiva Vascular, transparent membrane that covers the white sclera. Protects and lubricants the eyeball ciliary body Responsible for focusing at near objects. Makes the lens take on a thin/thick shape with muscular power to be able to alter the shape of the lens. Connected with the choroid. Cornea Transparent part of the eye that covers the iris and the pupil. Helps focus the light entering the pupil. Kept moist with a thin layer of tears and polished by eyelid movement What's the diameter and thickness of the cornea? 12mm diameter, 0.5mm thick Pupil Central opening in the iris which enlarges/contracts to vary the amount of light admitted into the inner eye. Why is the pupil black? Light does not reflect back out of the eye crystalline lens The lens of the ege Crystalline transparent, like crystal Power of Accomadation The lens accommodating changes from far to near vision by altering its shape as needed. Decreases with age. Iris Circular structure suspended in the fluid in front of the eye. Controls the amount of light reaching the lens by altering the pupillary opening. What do the two muscles of the iris do? Dilate (open), and constrict (close) Sclera Joins the cornea to form the eyeball, and slightly thicker than the cornea and helps maintain the shape of the eyeball. A very dense, thought tissue containing a minimal amount of blood vessels. Retina Light-sensitive tissue of nerves and high is the inner neural layer of the eye and is connected to the brain by the optic nerve. Converts light into nerve pulses which the brain then translates into colors and shapes. Choroid Located between the retina and sclera. Provides nutrition for the sclera and outer layers of the retina and the vascular layer of the eye. Optic Nerve The nerve connecting the retina to the brain. No light receptors in the area where the optic never exits the eye, causing a physiological blind spot. optic disk A hole in the retina where the optic nerve fibers exit the eye. How are you able to see with your eye? The eye refracts light with the cornea and the lens and produces a focus image that can stimulate neural responses and enable the ability to see. What are the two main refractive bodies in the eye? cornea and crystalline lens What is the primary refractive element in the eye? The cornea (75% of the eyes refractive power) What is the cornea's diopter power? 40-45D Aqueous Humor the clear fluid filling the space behind the cornea and in front of the iris and the pupil. Glaucoma increased intraocular pressure results in damage to the retina and optic nerve with loss of vision What is the refractive power of the crystalline lens? 20D