I I have a little astigmatism in my right eye but I want to know how they know it’s astigmatism and not just myopia. Is there like a chart or do they literally observe your cornea and determine your axis and power from that?
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Astigmatism can be determined in a number of ways. It can be measured by a technique called retinoscopy, where they make the room dark and shine a light in your eyes from a distance of about 66cm away. This is called objective refraction.
Another method is called subjective refraction and is where they ask you to look at some dots or rings and shoq you two sides of lenses and ask you which makes them look clearer and rounder
They do observe, but there is a machine that measures the roundness of your eye too. If you looked into a machine with a place to set your chin, and binoculars to look through with lights at the end, then they measured your cornea. They usually do this right before the standard eye exam.
excellent answer by Baby, as usual. thumbs up!
to add a few ways to measure astigmatism (in addition to Baby’s listed “retinoscopy” and “subjective refraction”, which were both correct):
keratometry, corneal topography, autorefraction