Cylinder Converter
Insert the prescription below
Sphere (SPH)
Cylinder (CYL)
Axis (AX)
+8.50
+8.25
+8.00
+7.75
+7.50
+7.25
+7.00
+6.75
+6.50
+6.25
+6.00
+5.75
+5.50
+5.25
+5.00
+4.75
+4.50
+4.25
+4.00
+3.75
+3.50
+3.25
+3.00
+2.75
+2.50
+2.25
+2.00
+1.75
+1.50
+1.25
+1.00
+0.75
+0.50
+0.25
0.00
Plano
-.--
-0.25
-0.50
-0.75
-1.00
-1.25
-1.50
-1.75
-2.00
-2.25
-2.50
-2.75
-3.00
-3.25
-3.50
-3.75
-4.00
-4.25
-4.50
-4.75
-5.00
-5.25
-5.50
-5.75
-6.00
-6.25
-6.50
-6.75
-7.00
-7.25
-7.50
-7.75
-8.00
-8.25
-8.50
-8.75
-9.00
-9.25
-9.50
-9.75
-10.00
-10.25
-10.50
-10.75
-11.00
-11.25
-11.50
-11.75
-12.00
+6.50
+6.25
+6.00
+5.75
+5.50
+5.25
+5.00
+4.75
+4.50
+4.25
+4.00
+3.75
+3.50
+3.25
+3.00
+2.75
+2.50
+2.25
+2.00
+1.75
+1.50
+1.25
+1.00
+0.75
+0.50
+0.25
0.00
SPH
DS
None
-.--
-0.25
-0.50
-0.75
-1.00
-1.25
-1.50
-1.75
-2.00
-2.25
-2.50
-2.75
-3.00
-3.25
-3.50
-3.75
-4.00
-4.25
-4.50
-4.75
-5.00
-5.25
-5.50
-5.75
-6.00
-6.25
-6.50
---
None
0
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172
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175
176
177
178
179
180
-.--
-.--
---
Formula:
SPH = SPH + CYL CYL = -CYL AXIS = AXIS + 90