A cataract is a visually disabling condition caused by clouding of the lens. The lens is an important optical component of the human eye and is normally transparent. When the lens protein degenerates and becomes cloudy due to various reasons, the patient will experience different degrees of vision loss, which is called a cataract and can eventually lead to blindness.
What are the typical symptoms of cataracts?
The most important and obvious symptom of cataracts is cloudy and blurred vision, which is always hazy and foggy in front of the eyes.
Loss of vision
The clouding in the periphery of the lens can not affect the vision, while the clouding in the central part, even if the range is very small, can seriously affect the vision. When the patient is in bright light, the vision is not as good as in low light because the pupil narrows and less light enters the eye. When the lens is severely clouded, vision can be reduced to light perception only or even blindness.
Reduced contrast sensitivity and blurred vision
In daily life, the human eye needs to distinguish between objects with clear boundaries and those with blurred boundaries, and the latter ability is called contrast sensitivity. Some cataract patients may not have significant visual acuity loss but may have a significant loss of contrast sensitivity, i.e., hypoplasia.
In patients with nuclear cataract, the refractive ability of the lens is enhanced, resulting in "nuclear myopia", while in the elderly, the old vision is reduced; after cataract, the degree of clouding in various parts of the lens varies, and the refractive ability of light is different, which can lead to "lens astigmatism". After a cataract, the lens has different degrees of clouding and refracts light differently, which can lead to "lens astigmatism".
Color vision change
The turbid lens enhances the absorption of blue light so that the affected eye's sensitivity to these colors decreases; in addition, changes in the color of the lens nucleus can also affect color vision.
Diplopia or hyperopia in one eye; visual field defects; glare, i.e., discomfort with bright lights such as sunlight and lamps, or even loss of vision when confronted with strong bright lights.
Why do we need glasses for cataracts?
- Now there have been studies confirming that ultraviolet radiation has a certain role in the occurrence and development of cataracts, if you have cataracts and want to make its progress slower, you can wear sunglasses to prevent excessive exposure to ultraviolet radiation when the sunlight is particularly strong outside;
- Early cataract patients often combined with refractive error, that is, with myopia, hyperopia, or astigmatism. If there is cataract and refractive error, optometry glasses can help improve the patient's vision, for early cataract patients have some help;
- Even after cataract surgery and implantation of IOL, most of the patients have refractive error after surgery and may have myopia, hyperopia, or astigmatism, so they can be given computerized optometry and glasses to help improve their vision.
- If the implanted IOL is a monofocal IOL, postoperative patients with phakic eyes, can not see clearly in the near place, can be equipped with presbyopia to help them see the near place, which is conducive to the patients read books, newspapers, cell phones and so on.
For cataracts, no matter whether they are operated or not operated, as long as they have a refractive error, they can be given glasses to further improve their vision.
What glasses are suitable for cataract patients?
What kind of glasses are suitable for cataract patients cannot be generalized, and need to be judged according to the patient's situation. It is recommended that cataract patients go to the hospital promptly, after clarifying the cause of the disease, under the guidance of the doctor to carry out the relevant treatment.
Farsighted glasses are a more common type of glasses, milder cataract patients can choose this kind of glasses, which can help to correct vision, heavier patients can consider changing glasses;
Cataract patients can also choose florid glasses, which can help alleviate visual fatigue, reduce cataract-induced blurring of vision and other symptoms;
Thinner convex lenses can reduce the damage of ultraviolet rays on the crystalline lens, which can slow down the development of cataracts, and thinner convex lenses can also increase the clarity of the field of vision;
Keratoplasty lenses are specially designed contact lenses that can be worn at night while sleeping and removed during the day to reduce cataract-induced vision fatigue.
Ordinary eyeglasses are worn directly in front of the eyes, but their surface has defects such as high refractive index, large focusing power, low dispersion coefficient, and so on, thus failing to achieve a better corrective effect, so they are not suitable for cataract patients to wear;
Corneal contact lenses
Corneal contact lenses are directly affixed to the corneal epithelium, but their surfaces are permeable to substances such as tears, which can easily lead to protein denaturation and subsequently aggravate the symptoms of cataracts, so they are also unsuitable for cataract patients to wear;
Dispersion coefficient of large glasses
Cataract patients can be manifested as cloudy color, for the dispersion coefficient of large glasses; the reflective, dispersion coefficient of small glasses, prone to the refractive index being too high, poor focusing ability, and other issues, can increase the chances of ocular discomfort, so it is not suitable for cataract patients to wear;
fragile and optical phase difference glasses
Due to cataract patients crystal can appear as physiological turbidity, in the wear contrast difference is large, easy to appear visual fatigue and other symptoms, so it is not suitable for cataract patients to wear.
How long to wear sunglasses after cataract surgery?
How long to wear sunglasses after cataract surgery takes about a month, the exact time is not certain, it needs to be decided according to the individual's recovery.
After cataract surgery, you need to wear sunglasses for a period, which can effectively reduce the damage caused by ultraviolet rays to the eyes, and at the same time can also achieve the effect of promoting the recovery of vision, so you need to wear sunglasses when you go out for about a month or so, and if the recovery speed is slow at this time, the time of wearing sunglasses may appear to be prolonged. You need to go to the local regular hospital to do the relevant examination to ensure that you can observe the recovery after surgery, and the doctor will also decide whether you need to continue to wear sunglasses according to the examination results.
After cataract surgery, you must pay more attention to rest, not too often stay up late or overworked, you need to ensure sufficient sleep time and rest time, also need to take a light diet and reduce greasy or spicy food intake.
Where to buy cataract sunglasses?
When we buy sunglasses, we should go to a large optical store or supermarket or a specialized hospital to buy them or buy Dollger sunglasses, which is a regular way of purchasing, and the quality of the glasses is more guaranteed.
(1) check whether the mirrored aviator sunglasses is flat and smooth, if the lens has bubbles, not clear, wear may be blurred.
(2) Whether the glasses have a UV logo on the packaging, if the sunglasses have UV protection on the packaging have UV logo, if there is no UV logo, that the glasses are not UV protected, and can not block ultraviolet rays.
(3) Hold the sunglasses in your hand, move back and forth against a fixed object, and observe the object during the process of moving, if the object gets bigger or smaller, don't buy such sunglasses, as it will damage our eyesight.
(4) The color of sunglasses should not be too dark, but choose teal glasses, because teal can not only absorb ultraviolet rays but also absorb blue light.