Delhi Journal of Ophthalmology

Decoding the Snellen’s Chart

Fayiqa Ahmed Bahkir
Department of Ophthalmology, Karpaga Vinayaga Institute of Medical Sciences and Research, Chengalpattu, Tamil Nadu, India

Editor-in-Chief, Delhi Journal of Ophthalmology, Dr R.P.Centre, AIIMS.

Corresponding Author:

Fayiqa Ahmed Bahkir
Karpaga Vinayaga Nagar, GST Road, Chinnakolambakkam, Madurantagam, Chengalpattu, Tamil Nadu – 603308, India
Email id:

Received: 16-JUL-2019 Accepted: 09-DEC-2019 Published Online: 21-JUN-2020

This article deals with the basis of visual acuity and the Snellen's Chart. The principles of trigonometry are applied in order to break down the science behind the Chart, and the laws of optics and refraction are used to build back the chart from scratch. The principle behind the construction of each optotype, and using the Snellen's chart in the clinic are explored.

Keywords :Optics, snellen’s chart, visual acuity

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