# Crossed Cylinder Calculator — user reviews

> 2 indexed App Store user reviews of Crossed Cylinder Calculator by Alta Vista LLC, rated 4.00/5 from 1 ratings.

- Source: https://appshunter.io/ios/app/crossed-cylinder-calculator/id963247457/reviews
- App overview in markdown: https://appshunter.io/ios/app/crossed-cylinder-calculator/id963247457.md
- Rating breakdown: 5★ 0 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 0

## Most critical reviews (2 lowest-rated)

### 1/5 — Axis incorrect

*2015-08-03, version 1.0*

I would gladly change my rating if this bug is fixed but I can’t find anywhere to contact the developer.  It calculates axis wrong.  If you enter +2.00-1.75x175 for glasses and over refract 0.00-0.50x90 the result it gives is +1.51-1.26x83 (it won’t round this result either), which is incorrect.
I cannot currently recommend purchasing this app until the error is corrected.

### 4/5 — Axis error

*2015-09-03, version 1.1*

Past version
This app has a drum system and is easy to use, I have found some glitches.  Firstly, the axis drums have an erroneous axis of 169 which should be 160. Secondly, a negative axis appears. This is not a big problem in that by subtracting that number from 180 gives the correct axis. For example, if lens worn is +2.50-1.75x167 and the Over Refraction is Plano-0.25x30, the result is +2.50-1.75x-9. -9 is equivalent to x171.
Update:
Axis problem is fixed. Recommend increasing range of spheres to + / - 20D. Or having an optional window to type in the needed power.
Typing in an axis may save time spinning the drum.

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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 2026-06-10.*