Is −3.25 eyesight bad?

−3.25 eye prescription, how bad is that?

On the usual scale it is moderate. That is the moderate band (−3.25 to −6.00): the sharp zone ends inside arm's reach, so lenses are part of getting dressed. The number says how far you see without lenses, nothing about how healthy the eye is: a −3.25 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 −3.25?

Bare-eyed at −3.25, everything closer than 31 cm is sharp edge to edge. Right at 31 cm the edges start to soften, and past it detail fades rather than disappearing. Inside the horizon: a phone held normally (30 cm). Past it: a book (40 cm), 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 ÷ 3.25 = 30.8 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 −3.25?

A lens that focuses exactly at a 60 cm screen would be about −1.50 (the full number less 1.67). The EndMyopia starting point for a close-up pair is −2.00, the full number less 1.25, which leaves the screen just inside the sharp range with a little blur at the far edge.