Cataract is a common and major blinding eye disease. Under normal conditions, it is transparent and light passes through it and some refractive interstitium to the retina so that people can see clearly. Once the lens becomes cloudy for some reason, it will affect the light entering the eye and reaching the retina, making it difficult for people to see, which is the occurrence of cataract. In other words, a cloudy lens that causes vision loss is a cataract.
Cataract is a common eye disease that manifests itself as a clouding of the lens itself or the lens capsule. The lens is like the lens of a camera, and it takes pictures when it lets in light. Our eyes are able to perceive the colorful world because light can be focused from the cornea of the eye through the lens and projected on the retina. Once the lens becomes cloudy, it blocks the light from entering the eye, at which point you will experience blurred vision, fear of light, darkening and distortion of the objects you see, and even blindness.
A mild clouding of the lens that does not affect your vision is not clinically significant. Cataracts are considered to be clinically significant when the clouding of the lens causes a decrease in vision, and in epidemiological surveys, clouding of the lens and a decrease in vision to 0.7 or less is considered as a diagnostic indicator.
Cataracts are the leading cause of blindness and visual impairment worldwide, mostly in people over the age of 50, and as the population grows and ages, cataracts will cause more and more visual impairment.
Cataract blindness is generally blinding and receiving cataract surgery before vision is significantly impaired can substantially reduce blindness and low vision patients. Cataracts and their modern surgical efficacy There are no medications with proven efficacy for the treatment of cataracts, and surgery is the main treatment. Surgical treatment of cataracts by ophthalmologists involves the surgical removal of the clouded lens. So, what is the effect of removing one’s own lens on the eye?
In addition to transmitting light, the lens of the human eye also acts as a convex lens, or magnifying glass. After the lens is removed, an artificial lens must be implanted, which is often referred to as an IOL implant. The purpose of IOL implantation is to correct the high degree of hyperopia caused by the surgical removal of the lens.
Since the introduction of cataract microsurgery, the method of cataract removal has continued to improve. From the traditional surgical method of cataract extracapsular extraction to the more advanced cataract ultrasonic phacoemulsification, there has been a transition from large incisions to small incisions. The former has a large incision, but this method will not be eliminated at this time. This is because some patients who are not suitable for cataract ultrasound emulsification still need to use this surgical method. The latter is characterized by small incision, small postoperative astigmatism, fast recovery of vision after surgery, low incidence of intraoperative and postoperative complications, and no rupture of the original wound in case of accidental injury after surgery.