Disorders of visual function

Corneal transplant are performed every day in hospitals around the world. the transplanted corneas come from cadavers. why do corneal transplant have such a low rejection rate. mark all that apply

Antigen presenting cells are not present in great numbers The cornea secretes immunosuppressive factors The cornea has no lymphatics

Age related macular degeneration that is dry is characterized by what?

Atrophy of the Bruch membrane

In open angle glaucoma, there is an increase pressure within the globe of the eye without obstruction at the iridocorneal angle. Usually this is caused by an abnormality in the trabecular meshwork which controls the flow or aqueous humor. where is aqueous humor in a normal eye?

Canal of Schlemm

Keratitis can be caused by different infectious agents. what is the treatment goals with her pes simplex virus keratitis?

Eliminating viral replication within the cornea

Vitreous humor occupies the posterior portion of the eyeball. it is an art amorphous biologic gel. when liquefaction of the gel occurs, as in aging, what can be seen during head movement

Floaters

Adult strabismus is almost always of the paralytic variety what is the cause of adult strabismus?

Graves disease

Causes of eyelid weakness include neurologic causes. there can be damage to the cranial nerves that innervate the eyelids, or there can be damage to the central nuclei of the cranial nerves. where are the central nuclei of cranial nerves III (oculomotor nerve) and VII (facial nerve)?

Midbrain and caudal pons

Pharmacologic agents can affect dilation of the pupil and the papillary response what types of drugs produce papillary constriction?

Miotic agents

When conditions occur that impair retinal blood flow, such as hyperviscosity of the blood or a sickle cell crisis what can occur in the eye?

Neovascularization

Cortical blindness is the bilateral loss of the primary visual cortex. what is retained in cortical blindness?

Pupillary reflexes

Dacryocystitis it's in infection in the lacrimal sac. what symptoms indicate dacryocystitis?

Swelling

Age related cataracts are characterized by what?

Visual distortion

Ophthalmia neonatorum is a conjunctivitis that develops in newborns. it is caused by the agents that cause sexually transmitted diseases. When should ophthalmia neonatorum be suspected

When conjunctivitis develops 48 hours after birth

Amblyopia, or lazy I occurs at the time when visual deprivation of abnormal binocular interactions occur in the visual infancy. whether Amblyopia is reversible depends on what?

Maturity of the visual system at time of onset.