Abstract
Objective To evaluate the accuracy of the IOL Master with a composite signal analysis technique in measuring artificial intraocular lens power of cataractous eyes. Methods In a prospective clinical study,41 patients (55 eyes) of nuclear cataract qualified for a phacoemulsification combined with artificial intraocular lens implantation were included.Eyes were randomly assigned to 4 groups according to the Emery-Little system classification and different measurement methods.Group A included 15 eyes and Group B included 10 eyes,respectively,both with lens nucleus grade Ⅰ～ Ⅱ,Group C and Group D both included 15 eyes with lens nucleus grade Ⅲ～Ⅳ.The power of artificial intraocular lens was measured by IOL Master with a composite signal analysis technique in patients of both groups A and C,and A-scan was used to measure the artificial lens power in patients of both groups B and D.A skilled clinical ophthalmologist performed all the measurement and all the cataract surgery.The refractive states were measured with an auto-refractomer after surgery and the average absolute value of predictive refractive error was calculated and compared. Results The average absolute value of predictive refractive error was 0.392±0.170 D in Group A,0.595±0.213 D in Group B,0.546±0.202 D in group C,and 0.639±0.229 D in Group D,respectively.There was statistically significant difference among all the four groups (P ＜0.05).There was statistically significant difference between Group A and Group B,Group A and Group C,as well as Group A and Group D (P ＜0.05).There was no statistically significant difference between Group B and Group C,Group B and Group D,as well as Group C and Group D (P ＞0.05). Conclusions IOL Master with a composite signal analysis technique is reliable and accurate for power calculation of intraocular lens in cataractous eyes,which can be widely used in clinical practice. Key words: IOL Master; Composite signal analysis technique; Power of artificial intraocular lens
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