Diff Dx

Question 1

Prevalence of myopia

Answer 1

~16%
3 times more likely with one myopic px and 8 times more likely with both

Question 2

Non organic visual loss

Answer 2

Px with reduced DVA in both eyes and ret result indicates emmetropia have non organic vision loss
May be accompanied by visual field defects
Young children could be because they wish to wear glasses

Question 3

Whats the diff dx of dv blur in 11yr old

Answer 3

Myopia with small amount of astigmatism
Simple myopia
Pseudomyopia
Non organic visual loss
Myopia linked to diabetic glycaemic changes

Question 4

Cataract related refractive shifts

Answer 4

~50% have myopic shift - nuclear cataract
~25% have astigmatic change - cortical cataract

Question 5

What could be the diff dx of 76 year old px with gradual onset DV and NV blur

Answer 5

Cataract
Hyperopic shift
Nuclear cataract
Cortical cataract
Myopic shift due to nuclear cataract
Early AMD
Posterior sub capsular cataract
Astigmatic changes due to cortical cataract
Late open angle glaucoma
Late AMD