For clinical decision support only · Not a substitute for surgical judgment
Patient Biometry
Keratometry
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.
1.25 D
Steep axis @ 90°
Corneal Astig
1.25 D
@ 90°
TCA (after SIA)
1.17 D
@ 88°
IOL Cylinder Needed
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Select lens
Spherical Power (SRK/T)
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D sphere
Toric models ranked by residual astigmatism. Click to select.
Model
Cyl IOL
Cyl Cornea
Align°
Residual
Match
Surgical Plan
⟳
Enter biometry and click Calculate. Recommended toric IOL will appear here.
Clareon Toric T4
Alcon · FDA SSED · HEMA
Sphere
21.00 D
Cylinder
+2.25 D
Alignment Axis
90°
Residual Astig
0.12 D
Axis Alignment Check
IOL Alignment
90°
Mark at 90° limbus. Each 1° of misalignment reduces correction by ~3.3%.
Expected Residual Astigmatism
0.12 D
Excellent
0 D0.5 D1.0 D≥1.5 D
Rotation Sensitivity
Each 1° misalignment = ~3.3% correction loss
5° off
±0.19 D
10° off
±0.39 D
30° off
±1.13 D
Clinical Notes
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Rx
IOLDx Clinical
⚠ Clinical Disclaimer
IOLDx Clinical is a decision support tool only. It is not a substitute for professional clinical judgment, surgical planning, or device labeling.
IOL power calculations must be verified by a qualified surgeon before surgery. Defocus curve data is sourced from FDA SSED submissions and peer-reviewed literature.