Choosing reading glasses correctly is crucial for those who need to wear them. Wearing reading glasses should adhere to the principle of clarity and comfort, and never simply consider price factors. You can buy ready-made glasses on the streets and even at street vendors. Because everyone has different degrees of presbyopia, the degree of presbyopia in both eyes may also be different. Some people also have vision problems such as farsightedness, nearsightedness, and astigmatism while experiencing presbyopia. If they wear inappropriate reading glasses for a long time, not only will they not solve the problem, but they will also cause eye bloating, headaches, and other problems. Therefore, only by going to a regular glasses store for optometry and glasses matching, and only reading glasses that are suitable for one's own visual condition, can one truly ensure eye health. It is best to customize exclusive reading glasses according to one's actual situation.
A good reading glasses should meet the optical requirements, have a price tag, and be comfortable to wear. Mainly reflected in the following aspects:
1. The shape of the lens must be relatively wide. Due to the convergence effect of presbyopia when viewed close, combined with reading and writing habits, the monocular axis should be moved downwards and inwards by 2.5mm when viewed far (flat) on the lens. When facing up, the pupils are generally above and below the midline of the lens, so in order to provide sufficient field of view for the reading glasses, the lens should meet the requirement of a height greater than 30mm above and below, rather than the smaller the lens, the better. Narrow films up and down within 25mm are generally portable and used temporarily to supplement vision.
2. The front of the glasses should be wide, but the OCD (optical center horizontal distance) should be smaller. Due to the fact that most users of reading glasses are middle-aged or above, with a plump face shape, the horizontal size of reading glasses is generally 10mm larger than the optical frame, but the near distance is 5mm smaller than the far distance. Therefore, the OCD value for women should generally be around 58-61mm, and for men it should be around 61-64mm. To meet both requirements, larger diameter lenses should be used and there should be a significant inward shift of the optical center during film production.
3. Reading glasses must be sturdy and durable. Old glasses are close range glasses, and the usage pattern for presbyopia is to supplement+0.50D (50 degrees) every 5 years starting from the age of 40 (+1.00D, or 100 degrees) in reading distance. Moreover, the frequency of removal and wearing during use is dozens of times higher than that of myopia glasses, so the parts of reading glasses must be sturdy or made of high elastic materials. The anti-corrosion and scratch resistance of electroplating must be outstanding, and the hardening process of the lenses should be good. Overall, it is necessary to ensure that there is no severe deformation, rust, or scratches within 2 years of use. In fact, in these aspects, the requirements for a good reading glasses are higher than those for mirror frames of the same grade.
