Cataracts Flashcards
1
Q
What are the majority of cases of cataracts due to?
A
- Age related
- UV light
2
Q
What are some systemic causes of cataracts?
A
- Diabetes mellitus
- Steroids
- Infection (congenital rubella)
- Metabolic (hypocalcaemia, galactosaemia)
- Myotonic dystrophy, Down’s syndrome
3
Q
What are some occular causes of cataracts?
A
- Trauma
- Uveitis
- High myopia
- Topical steroids
4
Q
Cataracts are classifed into what?
A
- Nuclear
- Polar
- Subscapsular
- Dot opacities.
5
Q
What happens in nuclear cataracts?
A
There is a change in the refractive index of the lens.
This is common in old age.
6
Q
What happens in polar cataracts?
A
These are localized and commonly are inherited.
They lie in the visual axis.
7
Q
What are subscapsular cataracts mainly due to?
A
These are commonly due to steroid use.
8
Q
Dot opacities are common in normal lenses.
What other conditions are cataracts with dot opacities due to?
A
Diabetes
Myotonic dystrophy.
