What Is Crystal Therapy?

Intraocular lens, also known as intraocular lens, is a precision optical component that is surgically implanted in the eye instead of the removed opaque crystal.

Intraocular lens, also known as intraocular lens, is a precision optical component that is surgically implanted in the eye instead of the removed opaque crystal.

Chinese name

Intraocular lens

Foreign name

intraocular lens

Intraocular lens concept

The main components of human crystals are protein and water. It will be fogged or cloudy due to aging, while atomized crystals will prevent light and images from projecting onto the retina. Damaged eyes, certain diseases, and even certain medications may cause the phenomenon of crystal fogging; according to statistics, more than 90% of cataract cases are also caused by the aging process that humans must go through. The turbidity and subsequent vision are affected, and the mechanism is still unclear. So far, no breakthrough has been achieved in drug treatment. The only really effective treatment for cataract is surgery, which is to remove the opaque lens and replace it with an artificial lens. This is an artificial lens. IOL implantation is the most effective way to treat cataracts. Thousands of cataract patients have obtained good vision through this safe and effective surgical method.

Intraocular lens, also called intraocular lens, is a precision optical component that is surgically implanted in the eye instead of the removed opaque crystal, which is equivalent to replacing a lens.

IOL morphology

It is usually composed of a circular optical part and surrounding support cymbals. The diameter of the optical part is generally about 5.5-6 mm. The role of the support is to fix the artificial lens. It can be two C-type or J-type wire support .

IOL classification

According to the placement position, it is divided into anterior chamber fixed IOL, posterior chamber fixed IOL, and posterior chamber fixed IOL. Usually the best place for IOLs is in the capsular bag of the natural lens, which is the position of the posterior chamber fixed IOLs.

According to the hardness, it is divided into hard IOL and foldable IOL. Hard IOLs cannot be folded and require an incision (about 6 mm) the same size as the optics of the lens in order to implant the lens into the eye. In order to adapt to the progress of surgery, the material of the intraocular lens is gradually improved. A foldable intraocular lens has appeared, which can be folded in half or even curled up. It is implanted by implanting forceps or implants. After entering the eye, the folded artificial lens The crystal will automatically unfold and be supported at the specified position.

IOL Features

IOLs can be divided into hard IOLs, folded IOLs, specially treated IOLs, multifocal / adjustable IOLs and aspheric IOLs, each with different characteristics.

(1) Hard artificial lens

The incision is about 5.6 to 6 mm. Such wounds sometimes require sutures, so the sutures will cause a certain amount of astigmatism. The short-term response after surgery is large and the recovery time is long.

(2) Folding IOL

The artificial lens is first folded, placed in a special implant, and then pushed inside to expand. The incision is generally 2.8 to 3.2 mm. The incision does not require sutures, astigmatism is relatively small, and the recovery time is faster. The disadvantage is that the price is Ordinary crystals are expensive. Prevent the formation of post-traumatic disorders, especially for diabetic patients. The materials of the foldable crystal are: silicone, hydrogel, and acrylic.

(3) Specially treated artificial lens

For some patients with specific eye diseases, this type of intraocular lens may be needed, for example: heparin surface-treated intraocular lens, the postoperative inflammatory response may be much smaller; the intraocular lens containing collagen can improve the intraocular lens and tissue Compatibility.

(4) Multifocal / adjustable intraocular lens

The previous several types of intraocular lenses have only one focal point and no adjustment power. They can be seen clearly when they are far away (presbyopia). On the other hand, they need to be complemented by nearsightedness. To overcome this defect, people have developed and applied them for 30 years. Multifocal artificial lens, which is mainly divided into two types:

A, multi-zone and multi-focal type, there are two zones, three zones, four zones, five zones, etc., that is, the artificial lens is divided into the central zone, the surrounding ring zone, the refractive power of each part is different, generally 2.5D, forming two focal points One looks near, the other looks far. The disadvantage of this type of crystal is that near and far vision is affected by pupil size and ambient light intensity.

B, diffractive multifocal type. This type of crystal is based on the wave theory of Huygens light. 30 small grooves with a depth of 2 m are carved on the rear surface of the artificial lens, which overcomes the change in pupil size of the partitioned multifocal crystal influences.

The common disadvantage is that the energy of the light entering the eye must be divided into two parts, half of which is near, half of which is far away, and the distance is not very clear. The visual acuity is affected to some extent. A few doctors and patients have not become the mainstream.

(5) Aspheric IOL

Reduce aberrations, effectively improve imaging quality, significantly improve night vision, close to normal eyes, especially suitable for elderly or driver patients with reduced mobility at night.

(6) Yellow artificial lens

IOLs are added with UV absorbers to block UV light, but ordinary IOLs cannot block blue light. Yellow IOLs are designed to block blue light and reduce light damage to the macula.

(7) Implantable miniature telescope artificial lens

It is suitable for cataract patients with macular degeneration, which can magnify the object image by 3 times and provide patients with monocular magnified central vision

To improve the quality of life, this crystal is still under clinical observation.

IOL difference

Normal people can see distant objects clearly because light passes through the refractive system, including the lens, to form a clear image on the retina. When looking close, it is accomplished by contraction of the ciliary muscles and pulling the lens ligament to change the convexity of the lens. A clear image can be formed on the retina when you see near and far.

IOL is made of artificial material-a kind of fixed diopter lens. When you look far away, you can get a clear image. When you look close, you can see it clearly with the help of a +300 degree viewing lens. With the continuous development of technology in recent years, the development of crystals into bifocal or multifocal artificial crystals is closer to the physiological lens, but the price is relatively expensive.