- 19.0LEGITIMACY SCORE
- 19.5SAFETY SCORE
- 4+CONTENT RATING
- $0.99PRICE
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A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen, who developed the chart in 1862. Select a vertical surface you want to pin the chart on, step 6 meters away from it, direct the rear camera towards the surface and start the program. After the chart is ...