12 - Opth - Refractive error - Contact lenses Flashcards
1
Q
reasons to wear - ocular - 4
A
- high myopia/hypermetropia due to distortion with glasses
- corneal irregularities
- keratoconus
- anisometropia - due to different image sizes with glasses
2
Q
other reasons to wear (non-ocular)
A
cosmetic, medialc (bandage lenses, Tx in lens), occupational - theatre film armed forces sports
3
Q
Two types of lenses
A
soft contact and rigid gas permeable contact lenses
4
Q
soft contact lenses -4 parts
A
flexible and good initial comfort
may be used for extended wear
safer for sport
poorer refractive result if high prescription
5
Q
rigid gas permeable contact lenses - 5 parts
A
durable
good refractive result
possibly more suitable for high astigmatism, corneal irregularities
poor initial comfort
smaller diameter, so prone to falling out of the eye
6
Q
complications from contact lenses
A
corneal abrasion
keratitis
