Visual System Flashcards
Refractory Errors
Primary cause of blurred vision
Astigmatism
Impaired eyesight because of impaired focus on retina causing near and far deficits, blurry vision
Presbyopia
Flattening of eye as we age
Images projected on retina causing difficulties seeing near objects
Myopia
Nearsightedness
Objects far away are blurry
Eye is too long or curved
Hyperopia
Farsightedness
Objects close are blurry
Eye is to flat or short
Cataract
Lens becomes opaque overtime and causes blurry vision
Strabismus
Visual axis of eyes are not parallel and eyes look in different directions
Types of Vertical Strabismus
Hypertropia
Hypotropia
Hypertropia
Affected eye sits high in orbit
Hypotropia
Affected eye sits low in orbit
Types of horizontal Strabismus
Esotropia
Exotropia
Esotropia
Affected eye is displaced medially in orbit
Exotropia
Affected eye is displaced laterally in orbit
Amblyopia
Reduction in visual acuity because of abnormality in eye that is caused by brain shutting how affected eye likely because of a strabismus
Age Related Macular Degeneration
Progressive degeneration of Macula and processes of central field of vision
Types of Age Related Macular Degeneration
Neovascular
Geographic atrophy
Neovascular
Wet eye related degeneration
Because of popped blood vessel
Geographic atrophy
Dry eye related degeneration
Retinal Detatchment
Retina is pulled away from normal alignment
Types of Retinal Detatchment
Rhegmatogenous, Tractional, and Exudative
Rhegmatogenous
small tear or break in your retina. When your retina has a tear or break, the gel-like fluid in the center of your eye (called vitreous) can get behind your retina.
Tractional
Scar tissue build up causing retina to pull away
Exudative
Fluid build up causes retina to pull away
