”Presbyopia” refers to the difficulty in using the eyes at close range at a certain age. This is a phenomenon of aging of human body function. This phenomenon occurs in most people around the age of 40-45. The eyes will feel that the small handwriting is blurred. You have to hold the mobile phone and the newspaper far away to see the handwriting clearly. It is clearer to see things in the case of sufficient light. The distance to look at the mobile phone becomes longer and longer with age.
When presbyopia appears, we need to wear a pair of reading glasses for our eyes to relieve visual fatigue. How should we choose when we buy reading glasses for the first time?
- 1.The lens shape must be relatively wide. Due to the collective effect of presbyopia when near vision and reading and writing habits, the visual axis of the single eye should be moved downward and 2.5mm inward when the lens is far away (head-up). When viewing head-up, the pupils are generally above and below the midline of the sheet shape, so in order for the reading glasses to have a sufficient field of vision, the sheet shape should meet the requirement that the upper and lower heights should be greater than 30mm, not that the smaller the sheet shape, the better. The narrow-film type within 25mm up and down is generally portable, and it is used for temporary supplementation of vision.
- 2.The front of the glasses should be wider, but the OCD (horizontal distance from the optical center) should be smaller. Since the users of reading glasses are all middle-aged and above, with plump faces, the horizontal size of reading glasses is generally 10mm larger than that of the optical frame, but the near-pupillary distance is 5mm smaller than the distance-pupillary distance, so the OCD value of women should generally be 58-61mm , Men should be around 61-64mm, to meet these two requirements at the same time, it is necessary to use a larger diameter lens and have a larger optical center inward movement when making the lens.
- 3.Reading glasses must be strong and durable. Presbyopic glasses are near-use glasses. The rule of eye use for presbyopia is that from the age of 40 (+1.00D, or 100 degrees) on the reading distance, it needs to be supplemented by +0.50D (that is, 50 degrees) every 5 years. Moreover, the frequency of taking off and wearing during use is dozens of times that of myopia glasses, so the parts of reading glasses must be strong or high-elastic materials. The anti-corrosion and anti-scratch performance of electroplating must be outstanding, and the hardening process of the lens must be good. Generally speaking, it must be guaranteed that it will not be seriously deformed, rusted, or rubbed within 2 years of use. In fact, in these points, the requirements for a good presbyopic glasses are higher than those for glasses frames of the same grade.
What kind of presbyopia glasses to choose is very important for people who wear glasses for the first time, because each person has individual differences, such as different height, arm length, eye habits, and the degree of presbyopia in the eyes is different. The presbyopia of the left and right eyes The degree may also be different, and some people have vision problems such as hyperopia, nearsightedness, and astigmatism at the same time as presbyopia. If you wear reading glasses that are not suitable for your eye condition for a long time, not only will it not solve the problem, but it will also cause problems such as eye swelling and headaches. Therefore, when the problem of presbyopia occurs, we should first go to a regular ophthalmology department or optical shop for optometry, and finally choose suitable presbyopia glasses according to our own situation.
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Post time: Jul-19-2023