20
English
How to use a Binocular Indirect
Ophthalmoscope
Table 1
LENS SIZE
MAGNIFICATION
FIELD OF
WORKING
VIEW (.
o
)
DISTANCE OF LENS
FROM CORNEA
(mm)
15D
52mm
3.92
40
60.0
45mm
3.89
35
60.6
20D
50mm
2.97
46
43.1
35mm
2.93
32
44.3
25D
45mm
2.41
52
32.8
33mm
2.36
38
34.2
30D
43mm
2.05
58
26.5
31mm
1.99
42
27.4
40D
40mm
1.59
64
17.7
31mm
1.53
50
19.0
Pan Retinal
2.2
52mm
2.56
56
34.1
