Tawk.to vs VisioMate Optical Calculator

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VisioMate is the optical calculator built for eyecare professionals. Convert prescriptions, transpose cylinders, measure PD, and calculate lens thickness and blank size — all in one fast, offline app. Whether you’re at the dispensing table or the exam room, VisioMate handles the everyday optical math so you don’t have to. FEATURES Contact Lens Calculator Convert a glasses prescription to contact lens power with automatic vertex compensation. Choose your vertex distance (8–14 mm) and get spherical equivalent and exact CL power for both eyes. Prescription Transposition Flip any prescription between plus and minus cylinder notation instantly, with correct axis rotation. PD Measurement — Distance & Near Measure pupillary distance in seconds using the TrueDepth camera — contactless, no ruler required. Choose Distance PD for far vision, or Near PD for reading: near PD is measured from the patient’s real eye convergence at an adjustable working distance (30–45 cm) with an on-screen fixation target — not estimated with a fixed offset. Save labeled measurements to patient profiles with full history and manual fine-tuning. (Requires a Face ID–capable iPhone or iPad Pro.) Lens Thickness Calculator Center and edge thickness per eye, computed with real sag/meniscus optics. Compare 7 materials side by side (1.50 CR-39 → 1.74) by thickness, weight, Abbe and cosmetics, get a smart recommendation, preview the lens in interactive 3D with cross-section view, enter frame dimensions (A, DBL, B, ED) with a live frame-shape preview, and export professional PDF reports. Blank Size Calculator Boxing-system decentration and minimum blank size (MBS) per eye. Get the smallest commercial blank diameter (55–80 mm) that safely covers the cut, with clear reasoning, a to-scale cutting diagram, smart warnings, and PDF export. Built for the way you work • Five languages: English, Greek, Italian, Spanish, French • Light and dark themes • Clean, distraction-free interface • Fully offline — no account, no sign-in