Eye Prescription Converter - Glasses to Contact Lens Rx Tool
Approximate conversion from eyeglass prescription to contact lens power. Uses vertex distance formula. For educational purposes only, consult your optometrist.
UD5 Toolkit
Approximate conversion from eyeglass prescription to contact lens power. Uses vertex distance formula. For educational purposes only, consult your optometrist.
View a series of digital Ishihara‑style plates. Not a diagnostic tool, just educational. Read numbers.
Simple interactive eye dominance test: hold up a virtual dot and see which eye stays aligned. Educational.