Opticalc Contact Lens Calc

May 30, 2024

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

December 6, 2022

- 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.

January 29, 2022

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

January 10, 2020

- 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!

July 19, 2019

- 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).

July 12, 2019

Two new calculation methods are provided: - Nominal contact lens power + over-refraction: A simple crossed-cylinder calculation. - Observed lens rotation: Calculate new axis based on nominal axis and observed rotation. Enhanced plus cal support over version 2.1: - A "plus cyl default" button in settings will cause results to be displayed in plus cyl form, and default all entered measurements to be in plus cyl form. - A fix to the axis being incorrectly calculated if one item is in plus cyl and the other in minus cyl. Some people have requested these additional calculations that seem to be more common, but tend to be less accurate than actually calculating the true power of the contact lens on the eye. Enjoy!

June 8, 2019

After a few requests, I've enabled a plus cyl form option in the lens prescription entry screen. Please let me know if there's any issues!

November 15, 2018

After 10 years of availability on the App Store, it was time for a redesign and rewrite so that the app would work properly with all the new devices released in that time. So I've given the app some love. It's been redesigned to put all the important information on one screen, rather than having to switch tabs all the time. It also works in both portrait and landscape, and on iPads as well (although the interface is fairly "sparse"). I'd love feedback on the app, how you use it, what you like about it. You can find the feedback address in the information screen. And please leave a review.

December 9, 2015

- Apple Watch. Oh yeah! Toric contact lens calculations on your wrist! - iPhone 6 and 6 Plus sizes supported. Keeping up with the times. Also, did I mention that I've added an Apple Watch app? It uses the digital crown to enter the powers which is pretty cool. It also uses watchOS 2, so it can be used without your iPhone present.

May 15, 2014

- Fixed calculation bug - Vertex distance now remembered properly - UI update for iOS 7. Enjoy!