Analysis Of The Effect Of Clear Corneal Incision In Different Direction Of Cataract Surgery And Application Of Dual Channel Vision Quality System

Objective: To investigate the effect of transparent corneal incision in different direction of cataract surgery and application of dual channel visual quality analysis system in the evaluation of visual quality before and after cataract surgery.Methods: prospective randomized study,64 patients(64 eyes)with cataract phacoemulsification combined with intraocular lens(IOL)implantation were enrolled in our hospital from May to December in 2016,and the results were comparable。Random grouping these patients into 2 groups,Group A with corneal incision in the temporal side of the eyes(right eye 10-11o’clock direction,the left eye 1-2 o’clock direction).Group B was treated with upper corneal incision,which was about 12 o’clock.All the selected cases were examined with standard logarithmic optical acuity and dual-channel optical quality analysis system(OQASTMII,Visiometrics).The visual acuity,MTF cutoff,Strehl ratio,objective scattering index and contrast ratio were compared between the two groups.The OQAS values were 100%,20% and 9%.Results:(1)The visual acuity and corrected visual acuity of all patients increased gradually from 1 day to 1 week post operation(P <0.05),and the visual acuity gradually stabilized after 1 week.The uncorrected visual acuity and corrected visual acuity at 1 day and 1 week were significantly higher than those in group B at the same time point(P <0.05).There was no significant difference in uncorrected visual acuity and corrected visual acuity between the two groups at 1 month and 3 months post operation.(P> 0.05)(2)1 day and 1 week after surgery,the OSI values of the two groups werehigher than those before operation,and all the time points were statistically significant(P <0.05).The OSI values of group A at 1 day(2.81±0.89)and 1 week(1.98±0.73)were significantly lower than those of group B at 1 day(3.46±1.17)and 1 week(2.61±1.20)post operation(P <0.05).There was no significant difference in OSI between 1 month and3 months post operation(P> 0.05).The OV9% values of the two groups were higher than those of the one day,1 week,1 month and 3 month postoperatively,and all the time points were statistically significant(P<0.05).The value of OV9% in group A at 1 day(0.29±0.09),1 weeks(0.33±0.12),1 months(0.37±0.14),and 3 months(0.42±0.17)was significantly higher than that in group B at1 day(0.24±0.10),1 weeks(0.27±0.09),1 months(0.31±0.09),and 3 months(0.34±0.14),which was statistically significant(P <0.05).The MTF,SR,OV100% and OV20%values of all the patients at1 day,1 weeks,1 months,and 3 months were not statistically significant(P> 0.05).There was no significant difference in MTF value,SR value,OV100% value,OV20% value,between the B group and the A group of the patients at 1 days,1 weeks,1 months,3 months(P> 0.05).Conclusion:1.In the operation of cataract,the temporal and transparent corneal incision was used,Postoperative intraocular scattering is small.The early visual recovery is fast and the visual quality is high.The long-term effect needs further study.Early visual recover rapidly,and with high visual quality,however,long-term effect remains to be further studied.2.Objective scattering index and OV100%、OV20% 、OV9% can comprehensively and objectively reflect the visual function of patients,It has important clinical value in evaluating the visual quality of cataract phacoemulsification combined with intraocular lens implantation.3.Dual channel visual quality analysis system can further quantify thevisual quality parameters,perfect visual quality assessment index,Has certain advantages in visual quality assessment.4.Dual channel visual quality analysis system is an new method for measuring light scattering,high order aberrations and light scattering to predict retinal imaging quality.To provide a reference and basis for the establishment of a comprehensive quality control system for cataract surgery.