Eyesight numbers · −1.50 explained
Is −1.50 eyesight bad?
−1.50 on the glasses paperwork means the bare eye focuses sharply out to about 67 cm (26.3 inches), roughly arm's length, and softens beyond that. That is the mild band (−0.25 to −3.00): distance softens, the close-up world is untouched.
Your glasses number
−1.50diopters
Sharp out to 67 cm bare-eyed. On a wall chart that lands around 20/50 to 20/70 approximate. With the glasses on, vision at this number is typically a full 20/20.
−1.50 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 −1.50 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 −1.50?
Bare-eyed at −1.50, everything closer than 67 cm is sharp edge to edge. Right at 67 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), a laptop screen (60 cm). Past it: 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 ÷ 1.50 = 66.7 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 −1.50?
A screen at 60 cm already sits inside the 67 cm sharp range, so at −1.50 there is no separate close-up number to work out: the full number is only for distance.
Try another glasses number
−1.50
- Sharp out to
- 67 cm
- 26.3 in, roughly arm's length
- Chart line, bare-eyed
- 20/50
- 20/50 to 20/70, approximate
The numbers either side
What to do with your number
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Or keep exploring with the free Eyeball Analyzer (20 minutes, your numbers, what they mean).
Limitations & disclaimer
EndMyopia treats myopia as a refractive state, not a medical condition. This is a free educational tool — not medical advice, diagnosis, or a substitute for a licensed optometrist. Measurements depend on camera quality and how carefully you mark the card edges; expect ±5–10 % on laptops, ±10–15 % on phones. For lens orders, eye health concerns, or any task requiring full 20/20 vision, see a licensed professional.
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