Scratches won’t affect the power of the lens, but they can reduce/obscure vision to a certain degree. Even fine scratches can “scatter” light, like a dirty windshield in sunlight. Bigger scratches serve as an object for the eye and, when the pupil passes over them, can also obscure vision slightly because the scratch is defocused upon the retina. Scratches not only interfere with your ability to see what you’re doing- a hazard in itself; they can also weaken the structure of the lens and its resistance to impact. Hence it advisable to change lenses and also get yearly eye check-up for ensuring healthy eyes.
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