12 - Opth - Refractive Error - Normal focus, Types, Myopia Flashcards Preview

CP2 > 12 - Opth - Refractive Error - Normal focus, Types, Myopia > Flashcards

Flashcards in 12 - Opth - Refractive Error - Normal focus, Types, Myopia Deck (6):
1

3 parts of the normal focusing system + their refractive power

cornea 40D
Lens 20D
axial length 22.22mm

2

4 types of refractive error

myopia
hypermetropia
astigmatism
presbyopia

3

Myopia is

short sightedness

4

Where is the light focused in Myopia + why?

light focused in front of retina due to
-refractive power of eye too strong (>60D)
-axial myopia - eye too long (>22,22mm)

5

Possible causes and associations

possibly genetic
as w - close work in early decades
-cataracts
-POAG
-PVD and retinal detachment
-Keratoconus

6

how to correct myopia

by divergent lens (CONCAVE) (-ve prescription)

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