Why can you get farsighted glasses (+ prescriptions) off a rack at the dollar store but near sighted glass (- prescriptions) need an optometrist appointment
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The primary reason for why near sighted glasses are prescription only is because of the fact that not everyone’s eyes are the same distance apart. So lenses have to be crafted specifically for the shape of your head to focus the curvature of the lens into your eye. Without this, even with the right prescription, as distance increases, your vision will blur more and you effectively aren’t getting the value of the glasses. The distance doesn’t even have to be that great, can be as little as 20-30 yards where things start to blur. This means simple tasks like driving, become more difficult. Additionally it causes much more eye strain as your eyes are having to focus much more and squint to make out those blurred things, causing headache and eye fatigue. And since you are wearing glasses during all waking hours, it is just all around not good. You could see this yourself by borrowing a friends glasses with a similar prescription. They just won’t work well for you, even if it is exactly the same prescription.
Now compare that to reading glasses where the focus lost from distance is non existent since what you are looking at is only up to a foot or so away, so eye strain and fatigue is pretty much non-existent. Couple this with the fact that you are likely only wearing the reading glasses for a few minutes at a time to read something and then taking them off. If you need to wear full time far sighted glasses, these would be prescription, as you would suffer some of the same things.
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