Although oversize glasses are beautiful, they should not be worn casually

Do you like oversize glasses? When choosing frames, most people will prefer oversize glasses, which have diverse and novel shapes and can also modify their face shape. In fact, not everyone is suitable for wearing oversize glasses.

An important parameter for optometry and glasses-pupillary distance: When wearing glasses, the optometrist will use a pupillary distance meter to measure it. The pupillary distance is the distance between the pupils. It is the distance between the centers of the pupils of the two eyes when the eyes are facing straight or parallel. distance. Interpupillary distance is an important indicator of the quality of glasses. When fitting glasses, the distance between the centers of the two lenses must be consistent with the patient's interpupillary distance. Otherwise, even if the prescription is correct, the patient will feel uncomfortable after wearing the glasses and affect vision. 

Compared with normal-sized frames, the offset position between the optical center point and the pupil of oversize glasses will be larger. For example, a oversize frame may be suitable for an interpupillary distance of 75 mm, but the eyeglass wearer's own interpupillary distance is only 60mm, with an offset of a dozen millimeters. In order to match your interpupillary distance, the optical center point of the lens can only be moved inward. This will cause a phenomenon: the middle of the lens is thin, the inner side is thick, and the outer side is thickest. It is equivalent to putting a pair of prisms in front of the eyes. , after the light is refracted, the wearer is prone to double images when looking at things. Over time, symptoms such as dizziness and visual fatigue will occur. This is the "prism effect".

Under normal circumstances, it is not recommended for people with high myopia to wear frames that are too large. Even if they choose lenses with a high refractive index, if the frames are too large, the lenses will appear particularly thick, unsightly, and heavy. Wearing them for a long time can cause the bridge of the nose to break. It doesn't feel good. In addition, if the wearer lowers his head or shakes his head slightly, it is easy for the glasses to slip. Therefore, if you want to wear a pair of large-frame glasses that suits you, you must go to a professional optometry institution for medical optometry and choose glasses that suit you based on your actual situation. Do not blindly pursue good looks and let your eyes suffer. harm.