Welcome back!
Crystal 🦊
Choose a game
🐻
Game 1 · Bears
Easy · flat
🔒
🐥
Game 2 · Chicks
Easy · flat
🔒
⊙⊙
Game 3 · EC1
Hard · cross
🌀
Game 4 · Rotation
Hard · pursuit
Choose a level (viewing distance)
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Eye training for kids

👋

Hi friend! What's your name?

Type your first name so we can cheer you on 🎉

Pick your buddy! 💕

This little friend will keep you company while you train.

CALIBRATION 1 / 2 · 40 cm & 80 cm

📏 Screen size

Hold a ruler against this screen. Drag the yellow handles so the orange line is exactly 5 cm long.
This calibration is shared by all games at the same physical screen.

Bar: 200 px → 40.0 px/cm
CALIBRATION 2 / 2

📐 Viewing distance

How far is your face from the screen? (a normal arm's length is around 40 cm)

cm
Mode: Game
Trials: –
Duration: 00:00
🎉

Session Complete

Crystal · today
Prism Diopters
Goal: –Δ
Score: –Δ
Prism Diopters · Goal vs This Session
Goal
This Session
This Session vs Last
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correct
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accuracy
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threshold Δ
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time
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