Optometer (ophthalmic instrument)
id:
optometer-ophthalmic-instrument-281-15607927
title:
Optometer (ophthalmic instrument)
text:
The optometer was a device used for measuring the necessary spherical and/or cylindrical corrections to be prescribed for eyeglasses, from the middle of the 18th century until around 1922, when modern instruments were developed. The term, coined in 1738 by W. Porterfield to describe his Scheiner slit optometer, and used for 200 years to describe many different inventions to measure refractive error of the eye, has completely fallen out of usage today as the task of measuring eyes for spectacles
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Optometer_(ophthalmic_instrument)
date created:
date modified:
2022-04-21T16:17:34Z
main entity:
{"identifier":"Q1472505","url":"https://www.wikidata.org/entity/Q1472505"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/d/d0/Greens%27_refractor_001.jpg","width":1032,"height":1404}
fields total:
13
integrity:
14