Healthcare and Medicine Reference
In-Depth Information
A. Diseases of the Retina
Retinitis pigmentosa
Macular degeneration
Retinal detachment
Electroretinogram
b
3
Light
c
Phagocytosis
Rods
Cones
b
Degeneration of
the photorecept.
cells
Hc
d
Occlusion of
central artery
Bp
Am
a
a
Retinal
detachment
Cell death
2
Occlusion of
central artery
G
Blindness
1 s
1
B. Diabetic Retinopathy
Normal fundus
Diabetes mellitus
Capillary
Glucose
Sorbitol
AGE
Pericyte
Thickening of
capillary wall
Swelling
Vessel narrowing
Ischemia
Vessel proliferation
Bleeding
Retinopathy (loss of vision)
Photo: Hollwich F. Taschenatlas der Augenheilkunde. 3rd ed. Stuttgart: Thieme; 1987
C. Night Blindness and Color Blindness
Vitamin A deficiency
Green blindness
(deuteranopia)
Red blindness
(protanopia)
all-trans-vitamin A
15
11-cis-vitamin A
10
Meta-
rhodopsin
Protanopia: no number
11-cis-retinal
5
Rhodopsin
Norm
0
Light perception
400
500
600 nm
Night blindness
2 Color blindness
325
Deuteranopia: no number
1 Visual pigment deficiency
3 Test charts
Search Pocayo ::




Custom Search