Cataract related knowledge and phacoemulsificationCataract is a common disease, eye disease, and is one of the main cause of blindness in th
Cataract related knowledge and phacoemulsification
Cataract is a common disease, eye disease, and is one of the main cause of blindness in the world. According to incomplete statistics WHO, about 2700 of the world's blind - 35 million, of which there are about cataract - 21 million, while China has about 5 million cataract.
What is cataract? There is a transparent tissue in the human eye, known as the lens (pictured), the lens in a variety of factors under the influence of loss of transparency, into a cataract that is turbid. In 1982, the WHO provided the diagnostic criteria for cataract: lens opacity, visual acuity below 0.7, and exclusion of other eye diseases. Two, cataract is how to form? Causes of cataract is various, cause relatively clear: aging, genetic and metabolic abnormalities, trauma, poisoning, radiation, local nutrition disorders, can make the lens protein denaturation caused by various factors, nutrition, metabolism and genetic, long-term effects of the comprehensive results of lens. Three, cataract is how to classify? 1, according to the etiology: divided into the elderly (age related), traumatic, concurrent, metabolic, toxic, radiation, developmental and subsequent cataract. 2, according to the onset time: divided into congenital and acquired cataract. 3, according to the lens opacity: divided into punctate, coronal and lamellar cataract. 4. According to the opacity of the lens: it is divided into cortical, nuclear and capsular cataract. 5, according to the degree of turbidity: divided into the initial period, expansion period, mature and over mature cataract. Cataract can be classified according to different methods, of which the most common is senile cataract. Four, cataract have those performance? Senile cataract often eye disease, but the onset can have, the degree of disease can also be inconsistent. Mainly there are shadows or fog, visual acuity decreased gradually, no redness, eye pain. Individual patients with monocular diplopia or halo, photophobia phenomenon. Children suffering from congenital cataract can be slow motion, poor eye movement, etc.. Five, what are the treatment of cataract? 1, drug treatment: there is no effective drug. Early cataract can be applied to some drugs slow the disease, such as: visual, Catalin, Ssha F Ai Faith and other eye drops. 2, surgical treatment: for the middle and late cataract, there is no specific drug can restore the transparent crystal opacity, so surgery is still the main method of treatment of cataract. Six, why is the best way to treat cataract?
Many surgical methods in the treatment of cataract, but the traditional large incision, incision to 10 - 12mm will remove the cloudy lens, need to suture and hospitalization, intraoperative and postoperative complications are more. Phacoemulsification only need about 3mm incision phacoemulsification instrument using the crystal phacoemulsification turbid, is currently the best method of treatment of cataract, has the following advantages: 1, small incision, suture, small astigmatism, rapid postoperative recovery, good effect. 2, not easy to tear sac after surgery, incidence of cystoid macular edema and retinal detachment postoperative complications such as low. 3, the operation time in advance to the immature period, even the early period, as long as the cataract cause your eyesight to drop to below 0.5 of your daily life and work, you can not have to wait for the surgery, the visual acuity decreased to light perception or manual, shortening the painful process of cataract patients bring things unclear. Seven. What should be done before cataract phacoemulsification? 1, eye examination: visual function, anterior segment, intraocular pressure, refraction, corneal curvature, A/ B. 2, systemic examination: blood pressure, blood and urine routine, liver function, blood glucose (fasting), ECG etc.. To know whether there is cough, constipation, drug allergy history, mental disorders, and so on, if there is abnormal, should take measures to treat.