vision impairment – Epidemiology and Technology

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Height of Tumbling E for Visual Acuity Assessments at various distances

person holding eyeglasses

When developing mobile apps / charts for assessing visual acuities using Snellen's / LogMAR notation, there is a need to estimate the size of letters for a given working distance for assessing a specific cutoff. Under normal vision, for a visual acuity of 6/6, the whole letter subtends an angle