Astigmatism affects roughly 1 in 3 adults, but most people don’t know they have it. An optometrist can diagnose it in minutes, but getting to one isn’t always convenient.
Enter the Siemens Star — a radial pattern of black and white lines. If all lines look equally sharp, your vision is likely fine. If some lines appear grey or blurry while others stay crisp, that’s a strong sign of astigmatism.
I came across this concept a while ago and realized something: most Siemens Star images online are terrible. Low resolution, badly printed, hard to use. So I built a free interactive version.
sighthealthpro.com — 30 seconds, no signup, works in your browser.
The tool is not a diagnosis. It’s a screening layer that helps you decide whether to book an actual eye exam. If the test flags anything unusual, the next step is always an optometrist with a phoropter.
It’s a simple tool, but sometimes simple tools solve real problems.
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