Independent planning, comparison and education tool.
⚠Clinical Disclaimer: For professional planning, education and comparison only. Always confirm using the current manufacturer-approved calculator, current IFU and clinical judgment. Product specifications may change.
About this tool & Important Notice
Universal Phakic IOL Planning & Comparison Tool
The Universal Phakic IOL Planning & Comparison Tool is an educational platform designed to compare the sizing concepts and calculation approaches of different phakic intraocular lens (pIOL) manufacturers within a single application.
The tool enables users to enter available biometric data and review how different manufacturers may approach lens sizing and vault prediction. It provides a structured overview of the characteristics, sizing ranges, calculation parameters, and planning philosophies of various phakic IOL systems, helping surgeons better understand the similarities and differences between them.
Additional educational features include anatomical illustrations, parameter explanations, interactive visualizations, and simulated vault predictions to support learning and training in phakic IOL planning.
Important Notice
This application is intended for educational, training, research, and comparison purposes only.
It is not an official calculator of any manufacturer and must not be used as the sole basis for clinical decision-making or lens selection.
Calculated lens sizes, predicted vault values, and recommendations generated by this application should always be compared with the official manufacturer calculators, current product instructions, and the clinical judgment of the treating surgeon.
The developers make no claim that the calculated results are identical to those produced by proprietary manufacturer algorithms. Final lens selection remains entirely the responsibility of the implanting surgeon.
By using this application, users acknowledge that it serves solely as an educational aid to improve understanding of phakic IOL sizing principles and to facilitate comparison between different manufacturer concepts.
Total Cases
0
STAAR EVO
0
Eyecryl
0
IPCL V2.0
0
With Follow-up
0
Incomplete
0
Right Eyes (OD)
0
Left Eyes (OS)
0
Quick Actions
About
Covers STAAR EVO ICL, Biotech Eyecryl Phakic, and Care Group IPCL V2.0.
Features: eligibility engine · power estimation · toric axis planner with physically rotating lens body · vault prediction · manufacturer comparison · case library.
Does not reproduce proprietary manufacturer algorithms. All vault estimates are clearly labelled as approximations.
Educational / Planning Use Only
Patient
New Case
Enter patient and clinical data.
Patient Identification
Corneal & Anterior Segment
Import Topography
AI-OCR · Pentacam · Galilei
Photograph or upload a Pentacam / Galilei printout — AI extracts K1/K2, axis, ACD, WTW, ECC automatically. Also accepts PDF exports.
API key required — set in Settings.
All processing via Anthropic API · no patient data stored.
Clinical History
Step 2
Refraction & Power Estimation
Enter manifest refraction. Results update automatically.
Manifest Refraction
Power Vectors & Transposition
Enter refraction above.
IOL Power Estimation
⚠Vergence estimate only — not a manufacturer algorithm. Use for guidance only.
Enter refraction and ACD.
Official Calculator Results (enter manually)
Data Completeness
Overall—
Optical—
Sizing—
Toric—
Vault prediction—
Step 3
Eligibility Assessment
Rule-based screening. Each rule shown explicitly.
⚠Uses documented published criteria. Manufacturer confirmation required before clinical use.
Detailed Rule Results
Enter patient data to see results.
Interactive Toric Planning
Toric Axis Planner
The entire lens body — optic, haptics, toric axis marks — rotates as one physical unit. The required correction axis stays fixed in the eye frame.
ℹHow it works: The outer degree circle and green target axis represent the eye. The central lens symbol rotates physically. Use Auto-Align or the slider to position the lens correctly.
Planning Inputs
°
Axis at which toric correction must be delivered in the eye (0–180°)
°
°
D
0.0° —
Lens Body Rotation
90.0°
Resulting Axis in Eye
—
Alignment Error
−90°+90°
Exact °°—
Manufactured Toric Axis (within Lens Optic)
Select the toric axis as manufactured in the optic. Fixed-axis lenses: choose from buttons. Custom-axis lenses: enter any value.
°
Custom axis available.
All Axis Options — Required Rotation per Option
Mfr. axis
Rotation
Direction
Resulting
Error
Select
★ Shortest rotation. Not automatically the clinical best choice.
Phakic IOL – Lens Reference
Posterior-chamber plate-haptic phakic IOL with 4 positioning holes and central port. The entire lens body rotates during placement to align the toric marks with the pre-marked corneal axis.
Rotation Sensitivity Simulator
Residual cylinder if lens rotates postoperatively from planned position.
Surgical Axis Plan
⚠Verify lens marking system before surgery. Confirm via current manufacturer IFU.
Step 5
Sizing & Vault Prediction
Estimated values only. Always use manufacturer-approved sizing methods.
⚠Important: Vault prediction models here are simplified estimates — not validated. Low vault (<100 µm) and high vault (>1000 µm) carry significant risks. Use manufacturer's own sizing calculator.
Vault — the clearance between the posterior surface of the phakic IOL and the anterior surface of the crystalline lens.
Target range: 250–750 µm.
Low vault (<100 µm) risks cataract; high vault (>1000 µm) may impair aqueous flow and IOP.
Accurate sizing is critical — always use the manufacturer-approved sizing calculator.
Sizing Inputs
Vault Visualization
Size & Vault Estimates
ℹ3 published models: Park 2016 · Igarashi 2019 · Gonzalez modified. ★ = recommended size. Lens Rise corrected when entered. Confidence increases with ATA + ACD.
Manufacturer
Model
Size
Mean Vault
Model Range
Assessment
Confidence
LR Adj.
Enter WTW or ATA above
STAAR EVO Size Selection Guide (ATA-based)
ATA Range
ICL Size
WTW approx.
Typical Vault
<11.0 mm
12.1 mm
~10.6–10.7
350–550 µm
11.0–12.0 mm
12.6 mm
~10.6–11.6
400–600 µm
12.0–13.0 mm
13.2 mm
~11.6–12.6
420–650 µm
≥13.0 mm
13.7 mm
≥12.6
380–620 µm
ATA = angle-to-angle horizontal (preferred). WTW approximation assumes ATA ≈ WTW+0.4 mm. Adjust per ACD. Verify with STAAR OCOS calculator.
Vault Prediction Models
Park 2016 (JCRS)
Vault = 507.4 + 340.4×(size−ATA) + 131.2×ACD R²=0.51, n=102 EVO ICL eyes
⚠Educational estimates only. Not validated for clinical sizing. Always use STAAR OCOS, Biotech Vault Predictor, or Care Group calculator + current IFU.
Biotech estimates: Park/Igarashi×0.90 (geometry approximation). IPCL: Park formula. Vault target 250–750 µm per general literature.
Official Results (enter manually)
Why WTW alone cannot perfectly predict vault
Two eyes with identical WTW may develop very different postoperative vaults. Vault depends on the 3D shape of the ciliary sulcus, the crystalline lens position (Lens Rise), and iris configuration — none of which are captured by WTW.
Influence of Lens Rise (CLR)
Higher CLR (e.g. +0.4 mm): the crystalline lens protrudes anteriorly, leaving less space for the phakic IOL → lower vault. Negative CLR: lens sits further back → higher vault. Measurable with AS-OCT or UBM.
Influence of Sulcus-to-Sulcus (STS)
STS is the actual diameter of the ciliary sulcus where phakic IOL haptics sit. Typically 0.3–0.5 mm smaller than ATA. Using STS directly in the Igarashi formula removes the ATA→STS approximation and improves accuracy significantly.
Influence of iris configuration
Convex/plateau iris: effectively reduces the anterior chamber depth available for the phakic IOL — associated with higher IOP risk and lower vault. This correction (−0.10 mm on ACD) is applied automatically when selected.
Architecture: future AI-ready design
The calculation engine, data model, and UI are separated so that new anatomical parameters or AI-based vault prediction models (e.g. neural network models trained on AS-OCT scans) can be added without redesigning the interface.
★★★☆☆ WTW+ACD only · ★★★★☆ + Lens Rise or LT · ★★★★★ + STS · ★★★★★+ STS+CLR
Step 6
Lens Comparison
All 7 posterior-chamber phakic IOL models — directly visible, no clicks needed.
ℹReference data only. Verify all specifications against current manufacturer IFU before clinical use. No lens is universally superior.
Step 7
Surgical Plan
Summary. Review before finalising.
⚠Final confirmation required using current manufacturer-approved calculator and IFU.
Planned Procedure
Warnings
Cases
Case Library
All cases stored locally.
No cases saved. Load a demo to start.
Reference Data
Manufacturer Database
All three platforms — all lenses shown directly. Always verify against current IFU.
⚠Educational reference only. Specifications subject to change. Verify with manufacturer before clinical use.
Learning
Education Module
Key concepts in posterior chamber phakic IOL surgery.
ℹSee the interactive tutorial: "Why a lens with a manufactured 90° axis can correct an ocular axis of 83°" — the entire lens body rotates.
Configuration
Settings
Display
AI OCR — Anthropic API Key
Required for topography import OCR. Stored locally only — never transmitted except directly to the Anthropic API.
Eligibility Thresholds
Data
All data stored locally. No patient data transmitted to any server.
