test 4 definitions.docx

- **Pupil**: the black hole in the middle of the iris that controls how much light enters the eye. - **Ciliary body**: is part of the middle layer of the eyeball and contains fingerlike ciliary processes that produce aqueous humor. The ciliary body helps change eye shape for near an...

- **Pupil**: the black hole in the middle of the iris that controls how much light enters the eye. - **Ciliary body**: is part of the middle layer of the eyeball and contains fingerlike ciliary processes that produce aqueous humor. The ciliary body helps change eye shape for near and far vision. - **Iris**: contains two groups of smooth muscles that constrict and dilate the pupil to regulate the entrance of light. Colored portion of the eye. - **Anterior chamber**: between the lens and the cornea is filled with aqueous humor. - **Posterior chamber**: between the lens and the retina, contains vitreous humor. - **Eyelashes**: help trap foreign particles, keeping them from landing on the eyeball. - **Lacrimal gland**: secretes tears that moisten, lubricate, and cleanse the surface of the eye. - **Tears**: contain an enzyme that helps destroy bacteria and prevent infections. - **Suspensory ligaments**: allow light to focus on the lens and retina, which is necessary for close vision. - **Ectropion**: eversion (outward turning) of the lower lid - **Photoreceptors**: specialized cells located in the retina of the eye that detect light and convert it into electrical signals. - **Presbyopia**: The ciliary muscle has less ability to allow the eye to accommodate, a process responsible for the gradual extension of distance from the eyes at which an item to be read is held. - **Presbycusis**: Impairment of hearing in older adults