Difference between revisions of Snellen chart
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→How to use a Snellen Chart with refraction
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{{main|Trial lens kit}} | {{main|Trial lens kit}} | ||
==Tools== | |||
* [http://www.i-see.org/block_letter_eye_chart.pdf Block Letter Eye Chart with calibration measurement instructions 20feet/6meters)] | * [http://www.i-see.org/block_letter_eye_chart.pdf Block Letter Eye Chart with calibration measurement instructions 20feet/6meters)] | ||
* [http://www.i-see.org/etdrs/etdrs-1.pdf ETDRS Snellen version 1 20feet/6meters] | * [http://www.i-see.org/etdrs/etdrs-1.pdf ETDRS Snellen version 1 20feet/6meters] | ||