Some toric lenses are weighted at The underside to be certain they stay in the ideal locale with your eye. This helps prevent them from rotating and only allows them to move vertically any time you blink. Coma, or comatic aberration, derives its title from your comet-like visual appeal on https://manuelyg3xq.ouyawiki.com/3378098/the_basic_principles_of_eyes_lenses