Bestsea Eyewear Manufacturer In China

  ...... About reading glasses What are  reading glasses ? Presbyopia is caused by the gradual loss of elasticity of the eye lens with age, which reduces the eye's accommodation power and leads to the phenomenon of not having clear vision at close range. Presbyopic patients feel that they cannot see clearly at close range and often push books far away to read. As presbyopia worsens, even if the book is taken far away, it cannot be seen clearly. If you force yourself to read or do close work, you will experience symptoms of visual fatigue such as eye fatigue, eye pain, blurred handwriting and even headache. Presbyopia can be corrected with the help of convex lenses (reading glasses). When making reading glasses, the first consideration should be wearing comfort, rather than one-sided pursuit of near vision clarity. The glasses should take into account the user's close work habits, the refractive state of both eyes and the accommodation power; pay attention to leaving appropriat...

  ...... Optometry  knowledge Optometry is to check the convergence of light after it enters the eyeball. It uses the state of emmetropia as the standard to measure the difference in convergence between the examined eye and the emmetropia eye. Since many people will almost always have a relationship with glasses in their lives, optometry is currently one of the most basic, most commonly used and important tasks for optometry workers. Therefore, in social life, both ophthalmologists and ordinary people are very familiar with the term optometry. Optometry methods Optometry mainly checks the deformation of the eyeball. Generally, there are two methods. One is to use instruments to check, which can preliminarily measure the deformation of the eyeball. The other is to use lenses for trial replacement, using a pair of glasses with interchangeable lenses to determine the degree of glasses that need to be replaced, so that a pair of suitable glasses can be matched. Large optical shops...

  ...... About  glasses lenses .  After talking about the frames, it's time to talk about glasses lenses. Lenses are the most important part of the frames, and can be said to be the soul of glasses. Why say soul, because lenses are functional. Imagine if the frames were not invented, would you still have a pair of glasses if you used a pair of lenses with a rubber band and a stick? Lenses are important, I won't say much, and if you don't even understand the importance of lenses, it's useless to say more. Main materials and characteristics of lenses. 1. Resin lenses. Lightweight (density about 1.32), impact-resistant, and affordable. The disadvantages are easy to scratch (need coating), low refractive index (1.50-1.74), suitable for ordinary degrees and daily wearers. 2. Glass lenses, high light transmittance (99%), high refractive index (up to 1.9), disadvantages are relatively heavy (density 2.54), fragile, poor safety, suitable for ultra-high degrees (need ultra-thin)...