ABSTRACT
AIM:
To evaluate the accuracy of SRK/T, Haigis, Barrett Universal II and Wang-Koch modified SRK/T formula in the operation of
cataract complicated by super-high
myopia.
METHODS:
A total of 44 cases(52
eyes)with super-high
myopia complicated with
cataract who underwent
phacoemulsification with tension ring implantation combined with
intraocular lens implantation in our
hospital from January 2020 to June 2021 were collected. SRK/T, Haigis, Barrett Universal Ⅱ formula and Wang-Koch modified SRK/T formula were used to calculate the postoperative reserved diopter before
surgery, and the actual diopter was measured by comprehensive
optometry at 3mo after
surgery. The mean absolute
refractive error(MAE)of four formulas was obtained to evaluate the accuracy of the calculation formula.
RESULTS:
The MAE of SRK/T formula, Haigis formula, Barrett Universal Ⅱ formula and Wang-Koch modified SRK/T formula were 0.86(0.56, 1.20), 0.79(0.56, 1.16), 0.68(0.30, 0.87), 0.65(0.43, 0.75)D, respectively, and MAE of SRK/T formula and Haigis formula were significantly higher than those of Barrett Universal Ⅱ formula and Wang-Koch modified SRK/T formula(P<0.01). According to preoperative corneal curvature(K), enrolled
patients were divided into K >46D group(12
eyes), 44D< K ≤46D group(24
eyes), and K ≤44D group(16
eyes). The MAE of SRK/T formula and Haigis formula were significantly higher than those of Barrett Universal Ⅱ formula and Wang-Koch modified SRK/T formula in the three groups(P<0.01). According to preoperative axial length(AL),
patients were divided into AL ≤30 mm group(24
eyes)and AL >30mm group(28
eyes). The MAE of SRK/T formula and Haigis formula in two groups were significantly higher than those of Barrett Universal Ⅱ formula and Wang-Koch modified SRK/T formula(P<0.05).
CONCLUSIONS:
Wang-Koch modified SRK/T formula and Barrett Universal Ⅱ formula are more accurate in predicting the degree of
intraocular lens in
patients with super-high
myopia complicated with
cataract.