Page 26
Diabetic Retinopathy
Lesions:
Focal hemorrhages
Aneurysms
Tangled vessels around the optic disc
Questions:
1). If a cornea/crystalline lens have a diopter of 60D, what is the effective focal length? (how far is it to
the fundus if this person has 20/20 vision
a. 16.6 mm
b. 1.6 mm
c. 166 mm
d. 16.6 cm
2). A convex lens does what with light?
a. Refracts
b. Diverges
c. Reflects
d. Diffracts
3). A concave lens does what with light?
a. Refracts
b. Diverges
c. Reflects
d. Diffracts