Low vision and visual rehabilitation Flashcards Preview

Ophthalmology > Low vision and visual rehabilitation > Flashcards

Flashcards in Low vision and visual rehabilitation Deck (12):
1

What are the main causes of visual impairment in children?

congenital cataracts
buphthalmos due to congential glaucoma
albinism
retinopathy of prematurity
optic atrophy
myopia

2

What makes congenital cataracts harder to treat than normal cataracts?

Children cannot have a replacement lense (aphakic) like adults. So strong glasses or contracts are used to stimulate visual development

3

What is Buphthalmos?

Congential glaucoma

due to a congential abnormality that blocks the drainage of aqueous.

4

What is the most basic sign of buphthalmos?

As the childs eye is more flexible you will see it bulge just with basic observation.

5

Explain the issues with being born myopic.

Most infants are born slightly hyperopic/hypermetropia/long-sighted

but those born myopic tend to become more myopic with age as the eye tends to elongate with development

This may need managing with lenses or glasses but resolution will still be worse than others, even with correction.

6

What are the main causes of poor vision in working age adults?

diabetic retinopathy
myopia
uveitis

(corneal dystrophies, macular degenerations and retinitis pigmentosa)

7

What are the main causes of poor vision in the elderly?

age related macular problems (dry and wet)
glaucoma
inoperable cataracts

(diabetic retinopathy/maculopathies)

8

What is the benefit of LogMAR charts over snellen charts?

LogMAR charts are fairer as there is an equal number of letters per line.

9

Name some advantages of soft lenses?

Comfortable (as flexible)
Secure fit (good for sport)

10

Name some disadvantages of soft lenses?

They can split (if worn for long time)
They are more expensive
Get deposits on them from tears

11

Name some advantages of rigid gas permeable lenses?

Fewer problems with deposits
Better for all day wear
Creates smoother ocular surface, thus better for astigmatism

12

Name some disadvantages of rigid gas permeable lenses?

Uncomfortable initially
Less secure as small diameter