Simple RPN Calculator

The RPN calculator for everyday use: 4-level stack, scientific functions, VAT, statistics and memory.

The Stile Ottica Converters below are Apps for Opticians, Optometrists, Orthoptists and Ophthalmologists.

CL-1  Contact Lens Converter - From glasses to contact lenses

Enter the glasses prescription and get the contact lens parameters in seconds. Whether you're an optical professional or a contact lens wearer, this tool gives you instant, precise results — vertex distance compensation, spherical equivalent, and 0.01D accuracy included. Clean, fast, accurate.

CL-2  Refraction over contact lenses

This app handles the oblique axis formula automatically — combining the residual refraction with the lens in situ using vector cylinder addition. No matter how much the astigmatism has shifted, you get the correct new contact lens parameters instantly. Built for practitioners who need accuracy.

Delta Converter  Vertex Distance Converter

Convert spectacle prescriptions to the exact power your patient needs. Supports toric and spherical lenses.

Easy Prismi  Prism Converter — Prism powers made easy

Combine, split, and transfer prismatic corrections using vector addition. TABO-based axis system, bilateral redistribution, and clear results — no mental math required.

Office Lenses  Find the perfect degressive lens for every client

Select a maximum working distance and get the exact degression, minimum near distance, ADD range, and a visual depth-of-field summary.

Stile Ottica Bundle 

Stile Ottica converters at an exceptional price. The essential suite for eye care professionals.