This app is a lite version of the EyeDock app (which requires a membership to www.eyedock.com).

The CL Calcs app includes these features:

- Vertexing calculator to convert from a spectacle Rx to the corneal plane. Accepts and returns results in plus or minus cyl. Also allows for different vertex distances.
- Vertexing tables
- Oblique cross cylinder calculator for calculating new toric lenses based on len rotation and overrefractions.
- Keratometry conversion calculator. (mm to diopters and vice versa). Allows for a wide range of curvatures so even flat post-surgical and steep ectasia corneas can be converted.
- Keratometry conversion tables
- Contact lens design, including: spherical and toric soft lenses as well as spherical, bitoric, front toric, and back toric RGPs.
- Contact lens design advice makes suggestions and gives pros/cons of different lens options (bitoric vs back toric, etc).

For all calculators a custom onscreen keypad with only the needed numbers and symbols (eg "x", "/", "@") makes entering refractions, CL powers, and keratometry values very fast - much faster than the standard keyboards or "spinners".

You might instead consider the EyeDock app, which includes all the above features as well as searchable contact lens and topical ophthalmic pharmaceutical databases. This app requires membership to eyedock.com.