Is −2.00 eyesight bad?

−2.00 eye prescription, how bad is that?

On the usual scale it is mild. That is the mild band (−0.25 to −3.00): distance softens, the close-up world is untouched. The number says how far you see without lenses, nothing about how healthy the eye is: a −2.00 eye with the glasses on typically reads a full 20/20 line, and every quarter step either way moves the bare-eye horizon a little.

Where does the blur start at −2.00?

Bare-eyed at −2.00, everything closer than 50 cm is sharp edge to edge. Right at 50 cm the edges start to soften, and past it detail fades rather than disappearing. Inside the horizon: a phone held normally (30 cm), a book (40 cm). Past it: a laptop screen (60 cm), a face across a table (1.2 m), a TV across a small room (2.5 m), a street sign (10 m).

The arithmetic is one line: 100 divided by the number gives the sharp distance in centimeters. 100 ÷ 2.00 = 50 cm. Every quarter step on the paperwork moves that horizon, which is why the pages either side of this one read differently.

What glasses number for a computer screen at −2.00?

A lens that focuses exactly at a 60 cm screen would be about −0.25 (the full number less 1.67). The EndMyopia starting point for a close-up pair is −0.75, the full number less 1.25, which leaves the screen just inside the sharp range with a little blur at the far edge.