Is It True that Nearsighted People Don't Get Presbyopia?
Heard a lot of myopic patient to say, myopic later won't presbyopia, actually this view is wrong, myopic patient also can produce presbyopia.Myopia is to see far see not clearly, should wear myopic glasses (a kind of concave lens) just see clearly.As presbyopia approaches, objects that are approaching need to be reduced in the strength of the concave lens (the equivalent of adding a convex lens), or even have to take off the glasses to see clearly.For example, if you used to have 250 degree myopia, but you now have 200 degree presbyopia, then you only need 50 degree concave lens to see near objects.At this point, you can see the near object without wearing glasses (because equal to only 50 degrees myopia) can see clearly.
In fact, you still have myopia and presbyopia, which only gives people an illusion that they can read newspapers without wearing reading glasses.
The degree of vision varies with age
The person is old giddiness is irreversible, visual acuity is better person giddiness symptom will be more obvious.If you once have a headache, eye pain and other symptoms, should immediately go to a professional shop with reading glasses.Reading glasses (a type of convex lens) are the simplest and most necessary method.Since the degree of presbyopia changes with age, the strength of reading glasses also deepens.
Two ways to match reading glasses
The first is to see the glasses degree of the objects at close range clearly, and then add 1/3 of the adjustment force for reserve;
The second is to use the lowest degree of lens to see objects at close range.The practice of many old people proves that the latter is better.
Principles of wearing reading glasses
Wear them as late as possible if you can get a closer look.Depth glasses are not worn at low degrees.General eyes first wear 75~100 degrees, after the annual increase of 50 degrees, until the age of 70.Wear glasses should first optometry, so as not to wear glasses at the beginning of the degree is too large, into the state of wearing more and more deep, cause ciliary muscle degeneration, damage to vision.Therefore, presbyopia people choose to wear the right reading glasses, just conducive to eye health care, is conducive to the convenience of life and work.
Long-sightedness and "presbyopia" are not the same thing
Hyperopia is a refractive error, the main performance of far vision is not clear, near more unclear, visual fatigue.Hyperopia occurs at an early age.Presbyopia is a natural physiological aging phenomenon, with the decline of regulation, from about 40 years old, with or without myopia or farsightedness will occur.It shows that the reading object can be seen clearly by putting it farther away, and at some point it will need a positive lens to help it see clearly.
Taking off your glasses is not "rejuvenating"
An old man who has been wearing reading glasses for more than ten years suddenly can do needlework without glasses recently, people think it is "rejuvenating".
The human eye is structured much like a camera, with a number of "regulating devices," including the lens and ciliary muscles within the eye.When looking at something close, the ciliary muscle contracts, the lens becomes convex, so that the object just falls on the retina, and you can see things clearly.The "adjustment device" of the eye gave something wrong, can appear myopia, farsightedness, presbyopia, and presbyopia is a kind of normal phenomenon on human body physiology.
