If you are over about 40 and need reading glasses you can buy ready-made reading glasses ('readymades') off-the-shelf from many different shops.
Reading Glasses. Presbyopia is a natural progression of our eyes as we age. It interferes with the eye's ability to focus on smaller print or objects close at hand.

reading glasses
Ready-made reading glasses,
One piece reading glasses
Low vision reading glasses
Handheld reading glasses
Men’s designer reading glasses