1. Tips for identifying inferior glasses
①. Check the surface of the lens: Use the lens to observe the light diagonally. If the finish is poor, the polishing will not be done. If there are spots, stones, stripes, bubbles, cracks, etc. inside the mirror, it is a inferior product.
②. Check the thickness of the lens: The thickness of the two lenses is different, the thickness of the single sheet is uneven, and the edges are weak and rough, which are inferior.
③. Check the glasses frame: If the surface of the frame is dull, scratches, bumps, corrosion, etc., or there are no code, specifications, sizes, grades, etc. printed on the frame, or the metal frame has low strength, poor elasticity, poor bonding, and poor polishing, etc., it should be considered as inferior glasses.
④. Observe and try-on effect: If you feel dizzy, observing objects blurred, and have deformed, it must be a inferior product.
2. The harm of inferior glasses to the eyes
①. The harm of inferior glasses to the human body: inferior glasses not only fail to achieve the purpose of correcting vision, but may also cause new refractive errors.
②. Low quality lenses: Low-quality lenses are often accompanied by surface defects such as shovel, spirals, scratches, and stripes, which will cause deformity and blurring of the visual object, causing dizziness, headache, nausea, etc.
③. Inaccurate optometry: If the glasses are not in line with the human vision needs, it will directly harm the patient, causing the person wearing glasses to feel a strong headache or discomfort.
④, lens optical center offset: If the optical centers of both eyes are different, double images will appear, causing the eye muscles to lose balance and cause visual fatigue, strabismus, amblyopia and other consequences.
⑤. Low-quality color discoloration mirrors lead to decreased vision: low-quality color discoloration mirrors, sunglasses absorb a lot of visible light, while ultraviolet rays that are harmful to the human eyes can pass through.