EyeCheck: Vision & Color Test

With both eyes open, you rarely notice when one of them gets worse. The better eye quietly covers for it.

EyeCheck is an eye self-check app that tests and records your left and right eye separately. It brings the methods eye clinics use onto your phone screen, and each test takes a minute or two. It is not a one-off score: your history shows whether anything has changed since last month.

■ Vision test (visual acuity)
· Four chart types: Landolt C, tumbling E, letters and picture symbols for kids
· Gets smaller when you are right, bigger when you are wrong — accurate in fewer steps
· Precision mode with 8 directions makes lucky guesses much rarer
· Near vision — the smallest print you can read at book or phone distance

■ Color blind test
· Dot plates whose numbers are generated fresh every time, so they cannot be memorised
· Color arrangement test (D-15) — order 15 colors and see which axis you confuse: red, green or blue
· Color blind filter — separates hard-to-tell colors in your photos, and previews how others with color vision deficiency see them

■ Astigmatism and more eye tests
· Astigmatism — pick the direction that looks blurrier on a radial fan chart
· Contrast sensitivity — how faint the letters can get before you lose them
· Glare — how much you lose next to a bright light
· Amsler grid — mark wavy or missing spots with your finger and compare them with last time
· Red-green (duochrome) — a hint whether your glasses may be too strong or too weak
· Peripheral vision — spot 24 dots at the edge while looking at the centre
· Eye tracking — the front camera checks how smoothly your eyes follow a moving dot
· Full course — run the tests back to back and finish with one summary

■ Built to measure properly
· Screen calibration — hold a credit card to the screen once and charts draw at true size
· Automatic distance — the front camera tells you how far you are from the screen
· Voice guidance and volume-key answers — test from two metres away without touching the screen

■ Records and eye habits
· Left and right eye saved separately, with trend charts
· Family profiles — keep kids and adults apart
· PDF report to take to your eye doctor, shareable result cards
· 20-20-20 eye rest reminders — every 20 minutes look 20 feet away for 20 seconds, plus 6 eye exercises
· Light and dark theme, 10 languages

■ Privacy
· Every test works offline
· Camera frames are analysed on the device and discarded immediately — never stored or sent
· No sign-up, no server. Your records stay on your phone
· Free with ads. No test is locked behind an ad

■ Please read
EyeCheck is not a medical device and does not diagnose any condition. Results can change with screen size, brightness, distance, lighting and glasses. If your vision suddenly blurs, lines look wavy or part of your view goes missing, see an eye doctor whatever the app says. This app does not replace a clinic — it helps you notice when it is time to visit one.

Contact: tk32189@naver.com

Recent changes:
First release of EyeCheck.

• 11 eye tests - acuity, near vision, color blind (dot plates, D-15), astigmatism, contrast, glare, Amsler grid, duochrome, peripheral, eye tracking
• Left and right eye tracked apart, trends, family profiles, PDF report
• Credit-card screen calibration, auto distance, voice and volume-key answers
• 20-20-20 eye rest reminders, color blind filter
• 10 languages, light and dark theme, works offline

No test is locked behind an ad. Not a medical device.