Jinxiang Glasses
Blog
08
2025
-
08
The difference between myopia glasses and reading glasses
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1. Lens Types and Optical Principles
Myopia Glasses
Designed with concave lenses, the lens edges are thicker and the center is thinner. They diverge light rays to move the image backward onto the retina, correcting blurred distance vision.
Lenses are marked with a minus sign (-), and the prescription is usually negative.
Presbyopia Glasses
Designed with convex lenses, the lens edges are thinner and the center is thicker. They converge light rays to enhance the focusing ability on near objects, improving reading difficulties.
Lenses are marked with a plus sign (+), and the prescription is positive.
2. Applicable Groups and Symptom Manifestations
Myopia Glasses
Suitable for farsightedness caused by excessive refractive power of the eyeball or an elongated eyeball axis, commonly seen in adolescents and young adults.
Clear distance vision after wearing, but near vision may become more blurred.
Presbyopia Glasses
Specifically for people over 40 years old, due to lens hardening and decline in ciliary muscle accommodation function causing difficulty focusing on near objects.
Clear near vision after wearing, but distance vision may be blurred.
3. Usage Scenarios and Correction Methods
Myopia Glasses
Mainly used for daily long-distance activities (such as driving, watching movies), requiring strict matching of distance pupillary distance.
Presbyopia Glasses
Designed for close-up work (such as reading, sewing), with near pupillary distance 4-6 millimeters smaller than usual.
Myopic individuals with presbyopia need to choose bifocal or progressive multifocal glasses according to their needs.
4. Special Precautions
Risks of mixed wearing: Incorrect use may worsen visual fatigue or vision problems, for example, using presbyopia glasses for distance vision will increase blurriness.
Identification method: Through lens light transmission experiments, convex lenses (presbyopia glasses) project concentrated light spots, while concave lenses (myopia glasses) project dispersed light spots.
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