0 Morty Asked: June 11, 2019In: Biology What are cylindrical eye powers, how is it different from normal eye power? 0 What are cylindrical eye powers, how is it different from normal eye power? In: Biology Share Facebook 1 Answer Voted malindrome12 Added an answer on June 11, 2019 at 2:06 pm The cylindrical power of the lens is the corrective element for the shape of your eye, it’s used to correct astigmatism. a person with a cyl of 0 has an eye which is near enough perfectly round and ball like, the further away from 0 you get (+ or -, they are the same but the way they are written changes the spherical power) the more squished, or like a rugby/american football the patients eyeball is. Now, the cyl has a second part to it, called the axis, this is measured between 1 and 180, and it’s the angle the eye is squished at (I can’t remember whether 90 is vert or horizontal, it’s been a decade since I sold glasses). Cyl powers affect the spherical power by making it weaker on one axis, by the given value. so if you have a -1.00 spherical and -0.25 cyl at a right angle to the part of the lens that is -1.00 the lens would be different by 0.25 (+/-, again it’s been a decade, sorry) If you want a fun experiment find someone you know who has cyl in their lens, and something square or rectangular. Hold the lens so you can see the square/rectangle thing through it and then rotate the lens. you should see that the square/rectangle changes shape as the lens rotates. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Attachment Select file Browse Featured image Select file Browse What is the capital of UK? ( London ) Save my name, email, and website in this browser for the next time I comment.