NUR 145 session 37

Vision is blurry at the close range and clear at a far range

occurs when light rays focus anterior to the retina, causing objects that are far away to be unfocused

Permanently change the contour of the cornea and correct refractive vision errors

it is an irregular curvature of the cornea, causing light to focus incorrectly in the retina, resulting in an uneven quality vision

it is a rapid regulator eye movement, either vertically or horizontally

“lazy eye” or subnormal vision in one eye that causes a child to use only one eye for vision while “resting” the other eye. it can also develop from strabismus (crossed eyes)

The name implies, that inability to perceive color correctly. it occurs in 4% to 8% of boys because 1 of the sets of cones of the retina that perceive red, green, or blue is absent

The inability to raise the upper eyelid the usual distance, so the eyelid always remains slightly closed

is an equally aligned eyes (cross-eyes) caused by an imbalance of the extra ocular muscles that control the movement of the eye globes, similar to the handling of reins of a horse

4 types of strabismus

• extropia

• esotropia

• Hypertropia

• paralytic strabismus

• amblyopia