Eye check tools

Small tools for understanding the numbers around your eyes, each with an explanation, a worked example and its limits. They help you prepare questions for your eye doctor; none of them replaces an eye exam.

• EVisual acuity converter20/20, 6/6, decimal and logMAR side by side, with the nearest chart line.
• RxGlasses prescription readerWhat SPH, CYL, axis and add mean for your own numbers, in plain words.
• CLGlasses to contact lens powerHow strong prescriptions change when the lens sits on the eye.
• +Reading glasses strengthA starting strength for ready-made readers by age and reading distance.
• EPrintable eye chartA tumbling E chart sized for your room, plus a near-vision card.
• #Amsler gridA printable grid for checking your central vision, with a record sheet.
• 2020-20-20 break timerA gentle reminder to look into the distance while you work.