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Inexpensive off-the-shelf glasses can be purchased at the walkway and supermarket. But doctors do not recommend doing this.
Why are ready-made glasses with diopters dangerous, and can they be worn
Many patients do not even try to visit an ophthalmologist for an eye exam, especially when it comes to presbyopia, age-related hyperopia. There is an opinion that it is useless, expensive, a visit to the doctor simply takes time: after all, it is so easy to try on glasses on the counter and take the necessary ones. However, doctors say that every person’s vision is different and ready-made glasses will definitely not fit for all indicators. It’s like taking all the different shoes out of the store and leaving only rubber boots in the size range. A leg sweats or freezes – nothing, you can endure.
Важно знать, что you do not have to pay for an eye exam and a prescription for glasses: Free selection on the device is available in most commercial opticians. In addition, the selection procedure can be done by an ophthalmologist for compulsory medical insurance in the clinic to which you are attached. You get an accurate diagnosis and a prescription – separately for the right and left eyes.
When the center is not the center
If you have always bought ready-made glasses, then most likely you do not know which one you have. distance between centers of pupils (RC). And this parameter is very important for vision correction and is measured in millimeters. When making glasses, the expert will combine this distance with the center of the lens and the geometric center of the frame’s light opening. Lenses of glasses from a kiosk usually have the same RC of 64–65 mm. However, the center-to-center distances of 8 out of 10 people are wider or narrower. These numbers are especially different for women, their RC is usually 59–63. The worse the vision, the thicker the lens, the more the wrong RC will be felt. Some people feel a difference of 1 mm, and 2–3 mm is perceptible for everyone.
Pitfalls
Ready-made glasses have a lot of other disadvantages that are invisible to the average buyer:
defects in the fit of the frame;
inconsistency of the RC even with the average indicator;
poor quality of the lens material (insufficiently transparent, cloudy, with an inhomogeneous structure, irregular surface shape);
poor quality lens coatings.
What is the impact of wearing such low-quality glasses without fitting? In some cases, people may experience:
headache;
dizziness;
distraction;
eye fatigue;
even more dangerous, intraocular and even blood pressure can rise.
The most offensive thing is that a person can attribute all these symptoms to the weather, stress, fatigue and simply age. After all, the eyes have adapted and see well.
It happens that the causes of discomfort are associated with incorrect selection of frames… Glasses can irritate the skin of the face and cause an allergic reaction. Rigid nose rests squeeze the bridge of the nose, causing fatigue. In addition, poor-quality temples that put pressure on the temples and the area behind the ears can provoke a headache.
Stopgap measure
Sometimes ready-made glasses can be helpful. This is a good option as a replacement for a few days if you ruined or lost your normal glasses. But even then it is better to go to the optics and buy a ready-made replacement with guaranteed quality there than to take an unknown Chinese product in the transition.
How to save money on glasses making?
Sometimes consultants in salons offer expensive thin lenses, without talking about cheaper, but not bad ones. It is helpful to ask about all the options available.
Different types of coatings are great, but each one costs a decent amount. Reading glasses may not need to be anti-reflective.
It is not necessary to buy an expensive, for example titanium, frame. Try on whatever is available for your size. Most likely, there is an inexpensive convenient analogue.
Pay attention to internet optics, especially in an epidemic. They have the same quality, but the price will be at least 30% lower. The courier will bring the frames for fitting, and then return the finished product.