Refractive error Flashcards
1
Q
Myopia:
- What is it?
- Length of eyeball
- What is this also called?
- What type of lens is used to correct this?
A
Can’t see far
Due to long eyeball
Short-sighted
Concave lens )( - refracts light less
2
Q
Hypermetropia - age-related:
- What is it?
- Length of eyeball
- What is this also called?
- What type of lens is used to correct this?
A
Can’t see near
Due to short eyeball
Long-sighted
Convex lens () - refracts light more
3
Q
Presbyopia:
- What is it?
- Why does this happen?
- What type of lens is used to correct this?
A
Age-related inability to accommodate - so affects near vision - that is why older people need reading glasses
The lens stiffens
Convex lens - repairs accommodation
4
Q
Astigmatism:
- What is it?
A
Distortion or blur due to an unequal cornea and lens curvature.
