VertexLensCalc is a free online calculator that converts eyeglass (spectacle) prescriptions to contact lens prescriptions using the standard clinical vertex distance formula (ISO 8980-1 and ANSI Z80.1). It handles sphere, cylinder, axis, astigmatism (toric lenses), and advanced parameters like pantoscopic tilt and face form angle. Results are provided instantly with no sign-up required, though it advises verification with an eye care professional.
Eyeglass is a Lifestyle & Personal project. Accurately converting eyeglass prescriptions to the correct contact lens powers accounting for vertex distance without manual math or optometrist visits. It is built as a consumer product for eyeglass wearers. It is available for free. Eyeglass is available on the web.
Key capabilities include Vertex Distance Calculator, Sphere Conversion, and Cylinder Conversion.
Summary written by a language model from the project’s public pages.
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