LensWright: Optician Calc
Vertex, prism, transposition
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Vertex compensated per meridian, not just the sphere. Transposition, prism, slab-off, thickness and blank size, each with its formula shown. $4.99 once, not monthly.
LensWright is the calculator opticians, lab techs and ABO students actually need — and it costs $4.99 once, not $4.99 a month.
Enter the Rx once. Every calculator prefills from it.
FREE, UNLIMITED
• Sphero-cylinder transposition (plus-cyl ↔ minus-cyl)
• Spherical equivalent
• Vertex compensation — applied PER MERIDIAN and re-formed, not just on the sphere
FULL UNLOCK ($4.99, one time)
• Prentice's rule and induced prism
• Vertical imbalance with a slab-off indicator
• Oblique meridian power
• Sagitta, centre and edge thickness
• Minimum blank size
• Compound prism (resultant magnitude and direction)
• Tilt and wrap (Martin's formula)
• Saved Rx history
• Lab-order PDF export
WHY VERTEX PER MERIDIAN MATTERS
Compensating only the sphere is the classic error. A −8.00 −1.50 × 175 does not keep a −1.50 cylinder at the corneal plane — it comes back near −1.23. LensWright compensates each meridian and re-forms the prescription, so what you order is what you meant.
EVERY RESULT SHOWS ITS FORMULA
You can check the work. That is the point.
100% ON DEVICE
No account. No network. No tracking. Any prescription you enter stays on your iPhone.
For professional reference only. Always verify before ordering or dispensing.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The one-time purchase is now called Dispensing Bench, named for what it actually unlocks: the seven paid calculators, saved Rx history, and lab-order PDF export. Same purchase, same price — if you already own it, nothing changes.
The developer, Donald Proctor, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Donald Proctor
- Size
- 947.2 KB
- Category
- Medical
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Dispensing Bench $4.99
- Copyright
- © 2026 Ripple