2024 Glasses knowledge
Regarding glasses knowledge, here are some detailed explanations:
Lens refractive index. The refractive index of a lens affects its thickness and wearing comfort. The higher the refractive index, the thinner the lens, but it may also affect visual effects and comfort.
Lens material. Although PC (polycarbonate) lenses have poor wear resistance, they have the advantages of being lightweight and impact-resistant. TR90 and pure titanium frames are lighter and suitable for wearing during sports. Acetate frames are more suitable for people with metal allergies.
Frame selection. For people with low prescriptions, the choice of frames is more diverse. For people with high myopia, choosing a smaller frame can make the lenses thinner.
Principles of optometry . The prescription principle of myopia lenses is the lowest power in the clearest state, while the prescription principle of farsighted lenses is the highest power in the clearest state.
Wear and care. Use both hands to remove and put on glasses to avoid frame deformation. Use special lens cloth to clean glasses. Avoid using ordinary paper towels or clothes to avoid scratching the lenses. At the same time, you should avoid placing your glasses in high-temperature environments, such as in cars or saunas, to prevent lens damage.
Astigmatism correction. When astigmatism exceeds 200 degrees, custom lenses are usually required.
Precautions for high myopia. For people with high myopia, in addition to regular fundus examinations, they should also avoid strenuous exercise to reduce the risk of retinal detachment.
This information can help you better understand how to choose, care for, and wear your eyeglasses.
