| ObjectiveCataract is the main reason of blindness and visual impairment in the world. With the growth and aging of population, visual impairment caused by cataract will be more and more. There has been 2 million blindness due to cataract. According to the current trend, it is expected to be 4,000 blindness due to cataract until 2025. The main reason of blindness is cataract in china, but 300 million people did not be treated timely.Although there has been many researches about risk factors of cataract, the exact caue is not clear. Currently, there are several hypotheses to illustrate the mechanism of cataract. Repeated childhood diarrhea caused by severe dehydration may be an important cause of cataract. There may be many other cataract-related factors, such as genetic factors, older women, exposure to gas fumes, nutrition, diabetes, lack of antioxidant vitamins, alcohol consumption, hypertension, and other glucocorticoids. UV radiation is generally considered the most likely cause, but no enough evidence. Untill update, there has no effective mothod of cataract prevention. Therefore, the treatment of cataract is very important. Materials and methodsThe simple out-patient age-related cataract patients with corneal astigmatism were included in this study. There were 30 patients (37 eyes) in total, Basic information of patients and examination results were recorded. These patients were divided into two groups:A group, the degree of astigmatism greater than 2.00 D,11 patients (13 eyes); B group, the degree of astigmatism between 1.00 D and 2.00 D, 19 patients (24 eyes). The small incision extracapsular cataract extraction without suture surgery and intraocular lens implantation were did in group A and group B on the maximum curvature in the corneal diameter line. A group of patients did another penetrating 4 mm incision on the other side of the cataract incision. Corneal astigmatism and visual changes before surgery,1 week,1 month,3 months after surgery are detected. We did with these results by SPSS 17.0 statistical analysis software. We considered statistically significant with P<0.05.ResultsVision:For group A, mean preoperative visual acuity was 0.15±0.04, the mean visual acuity were 0.57±0.07,0.67±0.07,0.67±0.06 respectively after surgery.Visual acuity before and surgery was significantly (P<0.05). For group B, mean preoperative visual acuity was 0.14±0.02, the mean visual acuity were 0.52±0.05,,0.56±0.06,0.59±0.06 respectively after surgery. Visual acuity before and surgery was significantly (P<0.05).Astigmatism:For group A, mean preoperative astigmatism was (3.06±0.89) D, the mean degree of astigmatism were (1.58±0.18) D, (1.18±0.17) D, (1.03±0.22) D respectively after surgery. The difference between preoperation and postoperation is significantly (P<0.05). For group B, mean preoperative astigmatism was (1.69±0.17) D, the mean degree of astigmatism were (0.67±0.04) D, (0.47±0.05) D, (0.26±0.13) D respectively after surgery. The difference between preoperation and postoperation is significantly (P<0.05). The difference of the amount of surgical correction of astigmatism was significantly (P<0.05). ConclusionSmall incision non-phacoemulsification cataract surgery can correct pre-existing astigmatism, combining with limbal corneal relaxing incision can correct pre-existing astigmatism largely and reduce patient discomfort from astigmatism and improve visual acuity. |
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