Patient Biometry
Surgically Induced Astigmatism
Use the surgeon's own centroid SIA when available. The default is a placeholder, not a personalized value.
Toric Confidence Inputs
| Device source | K cyl | Axis |
|---|---|---|
Device comparison does not replace topography review; it surfaces cylinder and axis disagreement before lens selection.
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
—
—
TCA after SIA
—
—
IOL Cylinder Needed
—
Select lens
Enter biometry and click Calculate to see corneal analysis.
Toric Planning Confidence
Axis · posterior cornea · SIA · devicesAxis Confidence
—
Calculate to review axis reliability.
Posterior Cornea
—
Assumption status.
Device Agreement
—
Cylinder and axis comparison.
Toric rationale appears after calculation.
IOL Power — Formula Results
SRK/T
—
Hoffer Q
—
Holladay 1
—
Haigis
—
Toric Models
Ranked by residual astigmatism| Model | IOL-plane cyl. | Corneal-plane equiv. | 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