# Opticalc Contact Lens Calc — Toric Lens Mislocation

> Contact lens calculator for fitting soft lenses and correcting toric lens misalignments. (iPhone/iPad app by Optical Directions Consulting.)

- Source: https://appshunter.io/ios/app/opticalc-contact-lens-calc/id309309095 (this page in markdown: same URL + `.md`)
- Developer: [Optical Directions Consulting](https://appshunter.io/developer/309309098)
- Category: Medical, Productivity
- Price: $3.99
- Rating: 3.70/5 from 3 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 24 MB
- Languages: American English
- Released: 2009-03-28
- Data updated: 2026-08-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/opticalc-contact-lens-calc/id309309095/reviews.md

## What is Opticalc Contact Lens Calc?

Opticalc Toric Contact Lens Calculator will help you improve your fitting skills when prescribing soft contact lenses.

Given a patient's refraction and vertex distance, it will tell you their ocular refraction corrected for vertex distance.

It then provides a recommended spherical contact lens power based on the patient's spherocylindrical refraction.

If you have a mislocating toric contact lens, Opticalc can tell you by how much the lens is mislocating, and suggest a new lens to order.

Once you enter the power of the patient's contact lens and the spectacle over-refraction, Opticalc will tell you by how much the lens
is rotating, and recommend the correct lens power to order.

Opticalc allows you to work in varying precision in both power and axis, depending on the parameter availability of the lens you are working with.

Use Opticalc to minimise the number of reorders required for your toric patients, make your initial lens selection for your sperical
patients more accurate, or use it to confirm that the lenses provided from the lab are correct.

Features freeform script entry. For example, entering "50" will automatically convert to "+0.50", entering -650 will automatically convert to "-6.50". Cyl powers are assumed to be minus, for example, entering "75" into a cyl power will be converted to "-0.75".

Also includes an Apple Watch app as a free bonus. The Apple Watch app is a stand-alone mini-version of the toric calculator. Enter the scripts and perform the calculations all from your wrist!

Please note that some contact lens calculators give incorrect answers. Opticalc uses the same calculations as can be found on this web page:
http://www.vco.org.au/misc/ophthalmicalc/OphthalmiCalc.html  --- Unfortunately, this page seems to have now disappeared.

## Key features

- Calculate ocular refraction corrected for vertex distance
- Recommend spherical contact lens power
- Identify toric lens mislocation and suggest new lens
- Calculate lens rotation and recommend correct power
- Support for varying precision in power and axis
- Freeform script entry with automatic conversion
- Includes a stand-alone Apple Watch app

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/opticalc-contact-lens-calc/id309309095/reviews.md

### 1/5 — Watch app not working

*2019-10-16*

Watch app opening then goes black. Tried to contact developer but gives me an error. Will update stars if this gets fixed. Purchased Burke to support developer but not happy when I got to use on my watch

**Developer response:** Hi Tay
Sorry, I'm aware of that issue and will try to fix it when I can.

### 4/5 — Easy to use

*2019-03-14*

Have it installed on my phone for many years now, though only used it a handful of times since it launches but glad to see the developer still updating it and it does come in handy when I needed it. The app look much more modern then before and is still easy to use. Thanks for still keeping it updated

**Developer response:** Thanks. I use it myself, so I keep it updated!

### 5/5 — Clean and nice

*2017-11-06*

Fast calculation and saves time.

### 5/5 — Vector math made easy

*2013-10-23*

Easy enough to calculate toric over refraction in front of the patient.

### 5/5 — Great app for a quick confirmation off the lens to order

*2012-04-06*

Works well

### 5/5 — A great app

*2012-03-09*

Very useful app for determining resultant cylinder Rx on toric lenses. I use this feature frequently.

### 5/5 — Two thumbs up

*2011-05-17*

Perfect contact lens app for getting a starting point on a new contact lens fit. Developer was very easy to contact and answered all my questions in a timely manner. Highly recommend.

### 5/5 — Works Great.

*2011-05-15*

Does what it promises. No, it doesn't convert to plus cyl, but is it really so difficult to do that math?

### 1/5 — OD

*2011-04-07*

I mostly work in plus cyl.  The calculator should be able to transpose to minus cyl much like the ToriTrack program available from CooperVision.

### 4/5 — It Calculates Toric O'Rx

*2011-02-16*

Easy to use. Works.

## Frequently asked questions about Opticalc Contact Lens Calc

### What is Opticalc Contact Lens Calc used for?

Opticalc Contact Lens Calc is a medical tool designed to assist eye care professionals in improving their contact lens fitting skills. It helps calculate precise lens powers, corrects for vertex distance, and addresses issues with mislocating toric lenses.

### How does Opticalc Contact Lens Calc help with toric lenses?

If a toric contact lens is mislocating, Opticalc can determine the extent of the mislocation and suggest a new lens power to order. It also calculates how much the lens is rotating and recommends the correct power based on spectacle over-refraction.

### Can Opticalc Contact Lens Calc handle different lens parameters?

Yes, Opticalc allows users to work with varying precision in both power and axis, accommodating the specific parameter availability of different contact lenses. This flexibility ensures accurate calculations for a wide range of lenses.

### Does Opticalc Contact Lens Calc have an Apple Watch app?

Yes, Opticalc includes a stand-alone Apple Watch app as a free bonus. This mini-version allows users to enter scripts and perform toric lens calculations directly from their wrist.

### What is the price of Opticalc Contact Lens Calc?

Opticalc Contact Lens Calc is a paid application, priced at $3.99. This one-time purchase provides access to all its features for improving contact lens fitting.

### Is Opticalc Contact Lens Calc suitable for all ages?

Opticalc Contact Lens Calc has an age rating of 4+, indicating it is appropriate for younger users to access. However, its functionality is intended for medical professionals.

### How often is Opticalc Contact Lens Calc updated?

The latest version of Opticalc Contact Lens Calc is 2.7, and it was last updated on May 30, 2024. This indicates a commitment to maintaining and improving the application.

### Does Opticalc Contact Lens Calc contain advertisements?

No, Opticalc Contact Lens Calc does not contain advertisements. As a paid application, it offers an ad-free experience for users.

## Version history (last 5 releases)

### 2.7 — 2024-05-30

Fixed vertex distance not updating correctly, and moved it to the main screen rather than settings.

### 2.6 — 2022-12-06

- Fixed the display of the rotation for contact lens over-refraction + nominal contact lens power. The "lens to order" was correctly displayed.
- Added a "Settings" and "Reset" button to the Apple Watch, since these functions were previously hidden in a force-press menu that is no longer supported on newer watches.

### 2.5 — 2022-01-29

- Minor UI bug fixes (ie. the power picker didn't show all the text properly).

### 2.4 — 2020-01-10

- Fixed a bug in the display of the Contact Lens + Over-Refraction apparent rotation which was showing the wrong way. I blame the coreolis force being backwards in the Northern Hemisphere.
- Fixed a bug where the calculations didn't update immediately after entering a new subjective refraction. No excuse.
- Fixed a bug where the Watch app would crash upon start. I blame watchOS 5 for changing something, and Apple for making it so hard to test Apple Watch apps.

- Watch app can now run independently of iPhone app.
- Dark Mode support on iOS 13. Looks really good on this app!

### 2.3 — 2019-07-19

- Bug fix: Fixed observed rotation incorrectly using nominal contact lens power rather than patient refraction for the axis to order.
- New feature: Added a quick action to the home screen icon to start a new calculation (equivalent to tapping the reset button).

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All apps by Optical Directions Consulting: https://appshunter.io/developer/309309098

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*