https://sgillies.net/enSun, 31 Dec 2023 01:26:19 GMTNikola (getnikola.com)http://blogs.law.harvard.edu/tech/rsshttps://sgillies.net/2018/01/15/reading-glasses.htmlSean Gillies<p>I bought my first pair of glasses with non-zero optical power last week: 1.0 dioptre reading glasses. These Twist readers are cheap ($20) and fold flat, which is a pretty cool feature. I chose yellow-green frames to help protect them from getting accidentally crushed.</p> <figure> <img alt="https://c1.staticflickr.com/5/4620/25840583328_42e8c52c80_b.jpg" src="https://c1.staticflickr.com/5/4620/25840583328_42e8c52c80_b.jpg"> </figure> <p>I had to remind myself what a dioptre is: it's the reciprocal of the optical length (in meters) of a lens, m^-1. This unit of measurement is the work of Ferdinand Monoyer, a French ophthalmologist. A Google doodle on May 9, 2017 <a class="reference external" href="https://www.google.com/doodles/ferdinand-monoyers-181st-birthday?hl=fr">commemorated Dr. Monoyer's work on his birthday</a>.</p> <figure> <img alt="https://www.google.com/logos/doodles/2017/ferdinand-monoyers-181st-birthday-5105939098107904.4-2xa.gif" src="https://www.google.com/logos/doodles/2017/ferdinand-monoyers-181st-birthday-5105939098107904.4-2xa.gif"> </figure>glasseslifehttps://sgillies.net/2018/01/15/reading-glasses.htmlMon, 15 Jan 2018 21:41:36 GMT