lecture 26 - opthamology: preventing blindness Flashcards
1
Q
What are the 4 types of refractive error?
A
Myopia, presbyopia, hyperopia/hypermetropia , astigmatism
2
Q
What is myopia?
A
A refractive error where a visual image falls in front of the retina (short-sightedness)
3
Q
What is hypermetropia?
A
Refractive error where a visual image falls behind the retina (far/long sightedness)
4
Q
What is astigmatism?
A
A refractive error where there is rotational assymetery in the eye’s refracting power. Two lens are needed to correct this.
5
Q
What is presbyopia?
A
A refractive error that occurs with age where the eye loses the ability to accomodate.
6
Q
What are the 4 most common causes of blindness globally?
A
Cataracts, age related macular degeneration, glaucoma, uncorrected refractive error
