# LensWright: Optician Calc

> Vertex, prism, transposition

Canonical page: [https://chrome-stats.com/d/id6790553187](https://chrome-stats.com/d/id6790553187)

## Overview

- **ID:** `id6790553187`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Donald Proctor
- **Category:** Medical
- **Version:** 1.0
- **Last updated:** 2026-08-26
- **First published:** 2026-08-26
- **Size:** 925 KB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/lenswright-optician-calc/id6790553187)
- **Website:** [https://lenswright-support.pages.dev/](https://lenswright-support.pages.dev/)
- **Privacy policy:** [https://lenswright-support.pages.dev/](https://lenswright-support.pages.dev/)

## Description

The optician's math, done right. Vertex per meridian, Prentice, transposition, thickness. $4.99 once — not a subscription.

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.

## Rankings

- #2,004,283 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6790553187)