518 Exam 2 Flashcards
What colour are conjunctiva normally? When would they be bloodshot?
Normally transparent. Blood shot during infection,, inflammation and injury.
Lesions on this pathway may impair sympathetic effects that dilate the pupil and cause mitosis.
Lesion in : hypothalamus. Brain stem. Cervical cord. Brachial plexus. Superior cervical ganglion.
Which cranial nerve innervates lateral rectus muscle ? (Eyes)
CN VI , abducens
Which cranial nerve supplies superior oblique muscle ? (Eyes)
Trochlear Nerve CN IV
Which cranial nerve supplies all other extra ocular muscles ? (Excluding lateral rectus and superior oblique)
Oculomotor nerve CNIII
What is diplopia
Double vision
What is hyperopia
Difficult with close work (farsightedness)
What is presbyopia
Aging vision
What is difficulty with distance vision? Or near sightedness
Myopia
Sudden visual loss is unilateral and painless. What could it be ?
Vitreous hemorrhage from diabetes or trauma, macular degeneration, retinal detachment, retinal vein occlusion or retinal artery occlusion
If sudden visual loss is painful , what are typical causes?
Usually in the cornea and anterior chamber. Corneal ulcer, uveitis, traumatic hyphema, acute angle glaucoma
Unilateral vision loss associated with headache, jaw pain or jaw claudication can be associated with _____?
Giant cell arteritis
Bilateral and painless vision loss consider ?
Vascular etiologies , stroke , or non physiologic causes
Bilateral and painful vision loss consider?
Intoxication, trauma, chemical or radiation exposure
Gradual bilateral vision loss usually arises from?
Cataracts, glaucoma, macular degeneration
Slow central vision loss can occur with
Nuclear cataract and macular degeneration
Peripheral vision loss can be seen in
Advanced open angle glaucoma
What are moving specks or strands that can appear as moving flashes of light across the visual field ? When can they occur?
Vitreous floaters. Occurs when posterior vitreous detaches from retina. Can sometimes cause retinal detachment.
What is a scotoma? What does it suggest ?
Fixed defects or blind spots. Suggests lesions in the retina.
Brain disorders such as seizure, migraine or reduced blood flow can cause what temporarily ?
Temporary scotoma
Red painless eye is seen in ___? What does it look like? It it harmful or harmless
Subconjuctival hemorrhage. Bright red patch. Usually harmless.
Red painful eye can be seen in
Episcleritis
What causes episcleritis?
Allergic response, autoimmune, vascular disease, infection
What are symptoms of episcleritis?
Redness, erythema, discomfort in the eyes and clear discharge. Sometimes painful.