This app is a very simple tool converting between ETDRS letter count and decimal (Snellen fractions) visual acuity (both ways).

Those of you who deal with visual acuity results given in ETDRS letter count and in decimals on regular basis will certainly fluently convert between those two systems on the go. But if you as ophthalmic care professional only occasionally handle with results of visual tests taken with ETDRS charts, then may benefit from having the opportunity to quickly convert from one to another by just tapping the result on your iPhone or iPad. No settings no hassle, just open the app input the value and tap ”Calculate” button to see the result. Simplicity and ease of use make this app useful for your everyday tasks.
There is also a possibility to convert into LogMAR if needed.

For details on how the conversion is being calculated go to www.dev.janiec.info/dev/main.html