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Value of Two Stacked Prisms
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Value of Two Stacked Prisms
The prisms are pointing in the same direction
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Stacked Prism Value Lookup
Prism Value of Two Prisms Stacked in the Same Direction
Select Initial Prism (PD):
10
12
14
16
18
20
25
30
35
40
45
50
Select Prism Stacked On Top (PD):
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
25
30
35
40
45
50
Lookup
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Table
1st Prism
2nd Prism
10Δ
20Δ
30Δ
40Δ
50Δ
10Δ
21
33
46
60
77
20Δ
33
47
66
89
122
30Δ
46
66
94
141
264
40Δ
60
89
141
339
50Δ
77
122
256
Adapted From:
Thompson & Guyton. Ophthalmic Prisms: Measurement Errors and How to Minimize Them. Ophthalmology 1983;90:204-2010
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