Posterior / Nuclear Cataract Flashcards Preview

Ocular Disease - Lens > Posterior / Nuclear Cataract > Flashcards

Flashcards in Posterior / Nuclear Cataract Deck (9):
1

Describe posterior sub capsular (cupuliform) cataract

(location, appearance, what causes it?, does it affect vision?)

- located under posterior lens capsule
- "orange peel, honey comb appearance"
- due to aging, trauma, steroids, diabetes
- major decrease in vision

2

Describe what patients usually have PSC (Cupuliform), what ocular symptoms they will complain of, near/distance vision affected more and how it could be caused

- Younger patients
- You see glare or decreased vision from miosis
- Near vision affected more than distance
- Can caused by secondary trauma, steriods (i.e. treatment for uveitis), inflammation, diabetes, ionizing radiation

3

What nuclear changes cause nuclear cataracts?

(What do new lens fibers do you nucleus, how does UV radiation cause biochemical change, what happens to lens (hardness and color) over time?)

- New fibers out outer portion push fibers inward and compact hardened nucleus
- UV radiation leads to accumulation of chromophors and cause nuclear sclerosis
- Lens becomes harder and more yellow leads to loss of elasticitiy (presbyopia)

4

What are the signs of nuclear cataract?

(Sudden or progressive onset, Refraction, nucleus color, myopic/hyperopic shift?, what type of diplopia?)

- regular progression
- variable refraction, myopic shift, yellow nucleus (urochrome pigment)
- monocular diplopia

5

What is the difference between burescent and cataract nigra?

- Burnescent: brown opacity (advanced stage)
- Cataract nigra: black color catarct

6

Describe characteristics of nuclear cataracts

(how much yellowing?, slow or fast progression?, affects distance or near vision more?, what color do patients have difficulty discrimination, what is lenticular myopia?)

- Excessive yellowing = nuclear cataract
- Slow progression, affects distance > near
- poor discrimination of blue
- lenticular myopia: increased refraction index

7

What are the percentage grades of PSC (Grade 1-4)

% of capsular space
- Grade 1: 3%
- Grade 2: 30%
- Grade 3: 50%
- Grade 4: >50%

8

What are the percentage grades of Cortical Cataracts (Grade 1-4)

% of pupillary space
- Grade 1: 10%
- Grade 2: 10-50%
- Grade 3: 50-90%
- Grade 4: >90%

9

What are the percentage grades of nuclear Cataracts (Grade 1-4)

- Grade 1: Mild
- Grade 2: Moderate
- Grade 3: Pronounced
- Grade 4: Severe