Snellen chart (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Snellen chart" in English language version.

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archive.org

Howett, Gerald L. "Size of Letters Required for Visibility as a Function of Viewing Distance and Observer Visual Acuity" (PDF). U.S. Government Publishing Office. United States Department of Commerce. National Bureau of Standards. Archived from the original (PDF) on 11 December 2017. Retrieved 11 December 2017. Alt URL

Hussain, Badrul; Saleh, George M; Sivaprasad, Sobha; Hammond, Christopher J (2006). "Changing from Snellen to LogMAR: debate or delay?". Clinical & Experimental Ophthalmology. 34, Jan/Feb (1): 6–8. doi:10.1111/j.1442-9071.2006.01135.x. PMID 16451251. S2CID 44724633. Each letter on the Snellen chart subtends an angle of 5 min of arc at the appropriate distance and each separate part (e.g. limbs of the letter E) subtends an angle of 1 min of arc.

Howett, Gerald L. "Size of Letters Required for Visibility as a Function of Viewing Distance and Observer Visual Acuity" (PDF). U.S. Government Publishing Office. United States Department of Commerce. National Bureau of Standards. Archived from the original (PDF) on 11 December 2017. Retrieved 11 December 2017. Alt URL

Hussain, Badrul; Saleh, George M; Sivaprasad, Sobha; Hammond, Christopher J (2006). "Changing from Snellen to LogMAR: debate or delay?". Clinical & Experimental Ophthalmology. 34, Jan/Feb (1): 6–8. doi:10.1111/j.1442-9071.2006.01135.x. PMID 16451251. S2CID 44724633. Each letter on the Snellen chart subtends an angle of 5 min of arc at the appropriate distance and each separate part (e.g. limbs of the letter E) subtends an angle of 1 min of arc.

Hussain, Badrul; Saleh, George M; Sivaprasad, Sobha; Hammond, Christopher J (2006). "Changing from Snellen to LogMAR: debate or delay?". Clinical & Experimental Ophthalmology. 34, Jan/Feb (1): 6–8. doi:10.1111/j.1442-9071.2006.01135.x. PMID 16451251. S2CID 44724633. Each letter on the Snellen chart subtends an angle of 5 min of arc at the appropriate distance and each separate part (e.g. limbs of the letter E) subtends an angle of 1 min of arc.

Colenbrander, August (2001). "The Historical Evolution of Visual Acuity Measurement" (PDF). 2001 Meeting of the Cogan Society for Ophthalmic History. Archived from the original (PDF) on 2014-07-17.

Colenbrander, August (2001). "The Historical Evolution of Visual Acuity Measurement" (PDF). 2001 Meeting of the Cogan Society for Ophthalmic History. Archived from the original (PDF) on 2014-07-17.
Howett, Gerald L. "Size of Letters Required for Visibility as a Function of Viewing Distance and Observer Visual Acuity" (PDF). U.S. Government Publishing Office. United States Department of Commerce. National Bureau of Standards. Archived from the original (PDF) on 11 December 2017. Retrieved 11 December 2017. Alt URL
20/20 Calculation, Dr. Craig Blackwell, MD

Hussain, Badrul; Saleh, George M; Sivaprasad, Sobha; Hammond, Christopher J (2006). "Changing from Snellen to LogMAR: debate or delay?". Clinical & Experimental Ophthalmology. 34, Jan/Feb (1): 6–8. doi:10.1111/j.1442-9071.2006.01135.x. PMID 16451251. S2CID 44724633. Each letter on the Snellen chart subtends an angle of 5 min of arc at the appropriate distance and each separate part (e.g. limbs of the letter E) subtends an angle of 1 min of arc.