Normal Eyes, Wear Minus Glasses?
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Minus glasses are glasses that are made specifically for people with nearsightedness (myopia). With the use of these glasses, the shadow of a distant object, which was previously far in front of the retina, can be corrected so that it falls right on the retina. In this way, even myopic sufferers can see distant objects more clearly so that they do not interfere with activities.
The use of minus glasses in people with normal sharp vision, if done in a short time is often not dangerous. The use of these minus glasses will not necessarily make your twin siblings come to experience nearsightedness. However, even so, the use of glasses with a minus is quite high in people with normal sharp vision can cause a variety of complaints, such as:
Eyes get tired easily, easily drowsiness, difficulty concentrating
Visual impairment, blurred
Dizziness, headaches, and so on
Therefore, your brother should not take these actions. If you want to use glasses as a variation of supporting appearance, for example, your brother can buy more glasses with normal lenses (without minus, plus, or cylindrical) that are widely available at optical stores.
That's all our explanation. For more details, you can consult directly with an ophthalmologist.
I hope this helps.