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

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You'll find it in the email after purchase.
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ℹ️ For parents: if your access key came from an eye care practitioner, your child's aggregate training progress (sessions, time, thresholds) may be shared with them to support care. Personal contact details are never shared. See privacy.
👋

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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