The boy bought glasses with the designation of the optical power of the glasses -1. What is the boy’s visual defect

The boy bought glasses with the designation of the optical power of the glasses -1. What is the boy’s visual defect (myopia or hyperopia)? What does the eyeglass lens designation show? What does the sign before the number mean?

The boy has myopia. The optical power of the glasses is -1 diopters. The minus sign means that the lens is diffusing.

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