| Objective:The purpose of this study was to compare postoperative visual quality of patients with different degrees of visual impairment for age-related cataracts and to provide a reference of the surgical indication for the surgery.Methods : A Prospective non-randomized controlled study collected Age-related cataract patients who were admitted to the First Affiliated Hospital of Hunan Normal University from February 2018 to June 2018.A total of 90 cases(90 eyes),including 40 cases of male patients and 50 cases of females.All the patients were divided into three groups according to the best corrected visual acuity before surgery.The classification criteria for visual impairment was issued by WHO in 2003.Group A had 20 eyes with the best corrected visual acuity <0.1 before surgery.Group B had 40 eyes with the best corrected visual acuity≥0.1 and <0.3 before surgery.30 eyes in group C with the best corrected visual acuity≥0.3 before surgery.All the surgeries were performed by the same experienced cataract surgeons.All of them measured Uncorrected visual acuity(UCVA)and best corrected visual acuity with an international standard visual acuity chart as well as intraocular pressure before operation and 1 day,1 week,1 month,and 3months after surgery.Objective scattering index(OSI),Modulation transfer function cut off(MTF cut-off),Strehl ratio(SR),OQAS value at 100%,20%,9%(OQAS value,OV 100%,OV20%,OV9%)were measured by optical quality analysis system(OQAS)before operation,one week after operation,one month,and three months after operation.Comparison of data before andafter surgery in each group.Meanwhile,data were compared among three groups at different times after surgery.Results:(1)(1)Comparison before and after operations:The uncorrected visual acuity of patients improved after undergoing cataract surgeries.The difference was statistically significant(P<0.05).(2)Comparison of different time point after operations:We found that the postoperative comparisons of uncorrected visual acuity among the three groups were statistically significant at one day,one week and one month(P<0.05)after surgery.There were no significant differences among them at three months after surgery(P>0.05).Comparing between any two groups,the one in group C had the best uncorrected visual acuity at one day after surgery,the worst in group A,and the middle in group B.The visual acuity in group C was better than that in group A(P<0.05)at one week and one month after operation.There was no significant difference between any two groups after three months(P>0.05).(2)(1)Comparison before and after operations:The best corrected visual acuity of patients improved after undergoing cataract surgery.The difference was statistically significant(P<0.05).(2)Comparison of different time point after operations:We found that the postoperative comparisons of best corrected visual acuity among the three groups were statistically significant after one day and one week(P<0.05).There were no significant differences among them at one month and three months after surgery(P>0.05).Comparing between any two groups,the one in group C had the best best corrected visual acuity one day after surgery,the worst in group A,and the middle in group B.The visual acuity in group C was better than that in group A(P<0.05)at one week and one month after operation.There was nosignificant difference between any two groups after three months(P>0.05).(3)Comparisons of parameters measured by OQAS: Except for the OV100% value of group C,other parameters all improved after undergoing cataract surgery,the difference was statistically significant(P < 0.05).The postoperative comparisons of MTF cut-off among the three groups were statistically significant after one week(P<0.05).There were no significant differences among them at one month and three months after surgery(P>0.05).Comparing between any two groups,the MTF cut-off of group B(32.17±1.65)and group C(32.92±1.80)was higher compare to that in group A(30.84±2.26)at one week(P<0.05).There was no significant difference between any two groups after one month and three months(P>0.05).For OSI,There were no clinically significant differences after surgery among three group or between two of them(P>0.05).The postoperative comparisons of SR among the three groups were statistically significant after one week(P<0.05).There were no significant differences among them at one month and three months after surgery(P>0.05).Comparing between any two groups,the MTF cut-off of group C(0.19±0.05)was better than group A(0.15±0.05)and group B(0.16±0.06)at one week(P<0.05).There was no significant difference between any two groups after one month and three months(P>0.05).For OV100%、OV20%、OV9%,There were no clinically significant differences after surgery among three group as well as comparison between two of them(P>0.05).Conclusions:1.Patients with simple age-related cataracts whose visual impairment were relatively slight before operation can obtain relatively good visual quality inthe early postoperative period.2.It is necessary to combine with optical quality analysis system examination to measure the visual quality of age-related cataract patients,particularly for its OSI values,which is more comprehensive and objective.3.OQAS can measure light scattering based on its two-channel theory.It is valuable to evaluate postoperative visual quality of patients with age-related cataract. |
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