exam 3 Flashcards
person has a lens that is too thick or an eyeball that is too long
myopia (nearsightedness)
person has a lens that is too thin or an eyeball that is too short
hyperopia (farsightedness)
lack of accommodation (thickening of lens) because the lens has less elasticity and cannot be thickened enough
presbyopia
the eye has an unequal curvature and the eye may be partly nearsighted, partly farsighted, or both
this problem is usually associated with the cornea
- a persons eye is naturally spherical in shape, under normal circumstances when light enters the eye it refracts evenly creating a clear view of the object. however with this, it is shaped more like a football or the back of a spoon. when light enters the eye, it is refracted more in one direction than the other, allowing only part of the object to be in focus at one time, objects at any distance can appear blurry and wavy
astigmatism
clouding of the lens, due to aging, disease, or injury
cataracts
brain suppresses input from one eye and depends upon information from the other eye- often called “lazy eye”
- corrected by covering the good eye with a patch and forcing the weak eye to function
amblyopia
aqueous humor accumulates ad pressure is out on the optic nerve
glaucoma
researcher walk got the Nobel prize in physiology or medicine
photochemistry
this is found within the rods
rhodopsin