Wearing glasses is a common phenomenon for most people. Proper care and maintenance of glasses can extend the service life of the glasses. Many of us have been wearing glasses for many years, but many of us don’t know how to fit or wear them. Proper wearing of glasses can improve vision and prevent the rapid progression of myopia; reasonable maintenance is also particularly important for the lifespan of glasses and the health of the eyes.

Who is not suitable for wearing photochromic lenses? If people with high myopia wear photochromic glasses, due to their poor vision and photochromic lenses, they will have difficulty seeing and may easily suffer from visual fatigue. Therefore, such people should not wear photochromic glasses. People with myopia accompanied by astigmatism and whose visual acuity correction is lower than 1.0 should not wear photochromic glasses. People with myopia and astigmatism must see things clearly in bright light. After wearing photochromic lenses, due to the dim light, the pupils will dilate accordingly, resulting in a narrow anterior chamber angle, resulting in poor aqueous humor drainage. Over time, it is easy to induce glaucoma. People suffering from cataracts, glaucoma and other diseases may aggravate their condition by wearing photochromic glasses, so they should not wear photochromic glasses.

In general, plastic single vision lenses will last around 2 years while glass lenses typically last 3-5 years. However, individual situations vary - it's important to monitor vision and glasses condition regularly rather than waiting too long between replacements. Replacing glasses before visual issues arise helps maintain clear sight. Consult your optometrist if unsure.

An informal survey showed that for many consumers, choosing eyeglasses is as casual a decision as picking socks. However, unlike socks where quality is apparent through touch, there is asymmetric information when buying glasses. Customers rely heavily on recommendations from optical store or clinic staff who casually throw around technical terms to confuse buyers. These terms can relate to brand, price, materials, optical design, UV protection, blue light blocking, digital lenses and more. This article focuses on one frequently mentioned term - optical design.

When we are used to wearing glasses every day for work and life, have we ever seriously thought about the relationship between lenses and our glasses, and how lenses correct our vision? Today we will unveil the mystery of how things work, discover how glasses improve vision, and what are the scientific principles behind their design? Let’s break down some key concepts in optics so we can better understand this marvel of medical technology.