Before You Begin
- ✦ Use a well-lit room — avoid screen glare
- ✦ Set screen brightness to a comfortable level
- ✦ Remove tinted glasses or contacts
- ✦ Sit 50–60 cm (20–24 in) from your screen
- ✦ Answer with the first number that comes to mind
- ✦ Select "Can't See" if you see no number
⚠️ For informational purposes only. Not a substitute for professional medical evaluation.