PresbyopiaThe right choice of reading glasses Many people gradually develop presbyopia as they age, especially when they

PresbyopiaThe right choice of reading glasses Many people gradually develop presbyopia as they age, especially when they are 45 years old, and the situation of presbyopia is gradually increasing, and presbyopia is also called presbyopia. Presbyopia is a normal physiological phenomenon.

Because the accommodative power of the eye is around the age of 10, it gradually weakens with age, and the remaining accommodative power is less and the distance between the near point gradually increases around the age of 45, which can no longer meet the needs of reading and the phenomenon of presbyopia appears. Presbyopia requires suitable reading glasses.

Reading glasses are a kind of biconvex lens, which can be used to supplement the lack of eye accommodation and achieve the purpose of treating presbyopia. So, how to choose reading glasses correctly? Before presbyopia, the first thing to do is to refraction, first determine whether there is myopia, farsightedness and astigmatism, and then increase or decrease the diopter according to age and the degree of presbyopia.

If you have myopia, subtract the presbyopia power of normal age from the degree of myopia.

For example, the original 200-degree myopia is now 45 years old (the normal age of presbyopia is 100 degrees), in fact, you can see near objects clearly by wearing 100-degree myopia lenses. If you have farsightedness, you should add the degree of farsightedness to the presbyopia of normal age.

For example, if you are also 45 years old and have 200-degree farsightedness, you should actually wear 300-degree reading glasses.

Of course, when fitting glasses, it is also necessary to increase or decrease the power of the lenses appropriately in combination with the usual working distance. If the working distance is close, the reading glasses should be appropriately increased, otherwise, the reading glasses power should be appropriately reduced.

The relationship between the age of normal people and the power of reading glasses is roughly as follows: Age (years) Reading glasses power 40 75 45 100 50 200 55 250 60 300 65 325 70 350 When wearing glasses, it is necessary to combine the working distance that the patient is used to, and appropriately increase or decrease the power of the lenses. On the contrary, the prescription of reading glasses can be relatively reduced. Of course, wearing reading glasses can only be used when looking at near objects, and you can't see anything clearly when looking at distant objects.