Patient Biometry
Surgically Induced Astigmatism
IOL Constants (SRK/T)
Toric IOL Selection
Toric powers are nominal IOL cylinder at the lens plane. Residual astigmatism calculated using thin-lens vector decomposition.
Corneal Astigmatism
Corneal Astig
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TCA after SIA
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IOL Cylinder Needed
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Select lens
Enter biometry and click Calculate to see corneal analysis.
Spherical Power (SRK/T)
SRK/T
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Hoffer Q
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Holladay 1
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Haigis
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Toric Models
Ranked by residual astigmatism| Model | Cyl IOL | Cyl Cornea | Align° | Residual | Match |
|---|---|---|---|---|---|
| Calculate to see toric options | |||||
⟳ Enter biometry and click Calculate
Clinical Notes
Vector Analysis (Double-Angle Plot)
Thin-lens decomposition
Corneal astigmatism
SIA vector
Target correction (TCA)
Residual astigmatism