Calculation of prismatic effect induced by decentration of spectacle lenses* :
Input spectacle dioptr, decentration value, direction and submit
Spectacle Prescriptions
R İ G H T E Y E
L E F T E Y E
Spher
Cylinder
Ax
Spher
Cylinder
Ax
"
Center of lens from pupilla
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
mm
In
Out
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
mm
Up
Down
pd horizontal effect
pd vertikal effect
Center of lens from pupilla
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
mm
In
Out
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
mm
Up
Down
pd horizontal effect
pd vertikal effect
Abbrevations:
BI:
Base In
BO:
Base Out
BU:
Base Up
BD:
Base Down
* For formulations thanks to Colin Fowler and Keziah Latham Petre's Spectacle Lenses book and google's googlebooks service
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