Toric Engine™ for post-operative toric IOL analysis by MIOLO
Post-op Toric IOL Axis Analysis
Implanted Toric IOL
Enter the cylinder printed on the lens box (e.g. T3 = 1.50 D).
Dilate, use retroillumination, keep the head level and read to the nearest 5°.
Post-Op Manifest Refraction
Sphere required (vertex correction); plus cylinder is transposed automatically.
About MIOLO Toric Engine
MIOLO Toric Engine is a free post-operative tool that shows, for an implanted toric IOL, the axis of minimum residual astigmatism and the expected residual at the current and at the calculated axis.
What it is for
It describes the optical state of an eye with a toric intraocular lens after surgery: how far the observed lens axis is from the calculated axis, and how much astigmatism is expected to remain at each.
Who it is for and when to use it
It is built for cataract and refractive surgeons reviewing a patient with residual astigmatism after toric IOL implantation, once the post-operative refraction is measured.
What you enter
The eye, the toricity of the implanted lens, the lens axis observed at the slit lamp, the post-operative manifest refraction (sphere, cylinder and axis) and, optionally, the IOL model and power, the steep K axis, the planned axis, the post-operative ACD and the weeks since surgery.
What you get
The calculated axis of minimum residual, the degrees and direction between that axis and the observed one, the expected residual at the current and at the calculated axis, and an interactive eye diagram in which the lens can be turned to see the predicted refraction.
Frequently asked questions
- Is it free?
- Yes. The calculator is free to use, with no fees and no ads.
- Does it tell me what to do?
- No. It describes the optical state with numbers; the decision belongs to the surgeon.
- Which axis should I enter for the lens?
- The axis observed at the slit lamp after surgery, not the planned axis.
- Can I simulate a different lens position?
- Yes. Drag the lens in the eye diagram to see the refraction predicted for each axis.
- Does it work on mobile?
- Yes. The page adapts to phones and tablets, and the result reads the same as on a desktop.
Further reading
The calculator supports, and does not replace, the surgeon's clinical judgment.