As we age, the lens gradually hardens and becomes less elastic, and the ciliary muscle function gradually decreases, thus causing a gradual decline in eye regulation. Starting at about 40 to 45, difficulty in reading and other close work occurs, and this physiological weakening of regulation due to aging is called presbyopia. As a result, reading glasses are required.

In the early stages of presbyopia, people often feel that they can only see clearly when they put the target farther away. When there is not enough light, the depth of field becomes shorter due to pupil enlargement, and the blurring of close reading is more obvious. This phenomenon gradually worsens with age. In the pre-presbyopia or embryonic stage, to see the near target needs to make an effort to use the adjustment, often produced due to excessive ciliary muscle contraction and the corresponding excessive collection of eyestrain symptoms.

The symptoms of presbyopia are generally as follows:

(1) Difficulty in seeing near

Patients gradually find that they cannot read small print clearly at the usual working distance to which they are accustomed. In contrast to myopic patients, patients unconsciously tilt their heads back or take books and newspapers further away to read them clearly, and the required reading distance increases with age.

(2) Reading requires greater illumination

This is because sufficient light increases the contrast between the book and the text and causes the patient’s pupils to narrow, increasing the depth of field and improving vision.

(3) Near vision cannot be sustained

Because of decreased accommodation, patients have to work at close range in a state close to the limit of binocular regulation, so it can not last; at the same time, due to the linkage effect of regulation collection, over-regulation will cause excessive collection, so it is easy to read the newspaper serial, the handwriting into a double, and finally can not be read. Certain patients may even experience symptoms of visual fatigue such as eye swelling, tearing, and headache.

Presbyopia is a physiological phenomenon, regardless of the refractive state, everyone will experience presbyopia, and with age continues to deepen the degree of presbyopia, but through the supplementation of lutein required by the eyes, clearing the eye free radicals can be effective in alleviating and reducing the symptoms of presbyopia.

In addition to age, the occurrence and development of presbyopia is also related to the following factors:

(1) Refractive error 

Presbyopia occurs earlier in hyperopia than in myopia; after myopes wear frames, due to the existence of the corrected negative lens at a distance of 12mm to 15mm from the corneal apex, it reduces the need for adjustment for the same reading distance, while myopes wearing corneal contact lenses have a corrected optical system close to that of the orthopedic eye because corneal contact lenses are fitted to the corneal surface; therefore, they appear earlier in presbyopia than those wearing ordinary Therefore, wearing corneal contact lenses will cause presbyopia earlier than wearing ordinary frame glasses.

(2) The method of eye use 

The need for adjustment is directly related to the working distance, therefore, people who are engaged in close and delicate work are prone to presbyopia symptoms, and those who are engaged in delicate close work will develop presbyopia earlier than those who are engaged in long-distance work.

(3) Physical quality of the patient 

Tall people with long arms have a longer working distance than short people with shorter arms and need less adjustment, so the latter develop presbyopia symptoms earlier.

(4) Geographic location 

People living near the equator experience presbyopia earlier because of the effect of temperature on the lens.

(5) Effect of medication 

Patients taking insulin, anxiolytics, antidepressants, antipsychotics, antihistamines, antitussives, and diuretics experience presbyopia earlier due to the effect of the medication on the ciliary muscle.

For presbyopes, CheRing offers reading lenses and bifocal and varifocal lenses to match different frames.