Klinika oczna · 2013
The accuracy of IOL power calculation formulas for eyes of axial length exceeding 24.5 mm.
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Stopyra Wiktor
Аннотация
PURPOSE: To compare the accuracy of different IOL power calculation formulas for eyes of axial length exceeding 24.5 mm.
MATERIAL AND METHODS: 61 patients were examined, whose ocular axial lenght ranged between 24.51 mm and 26.72 mm. Preoperatively, the IOL power for each patient was calculated using six different formulas (SRK II, SRK/T, Binkhorst, Hoffer Q, Holladay 1, and Haigis). The power of the actually implanted IOL was based on Holladay 1 formula. Visual acuity was measured using Snellen chart on the 30th postoperative day.
RESULTS: 54 patients (88.5%) achieved full visual acuity (1.0 on Snellen chart) after cataract surgery. If other power calculation formulas were used for the actual IOL, this would be achieved respectively in: SRK/T - 39 patients (63.9%), Hoffer O - 22 patients (36.1%), Binkhorst - 21 patients (34.4%), Haigis - 7 patients (11.5%), SRK II - 5 patients (8.2%).
CONCLUSIONS: 1. Holladay 1 formula is recommended for intraocular lens power calculation for eyes of axial length exceeding 24.5 mm. 2. SRK/T formula also seems to be satisfactory for these cases.
MATERIAL AND METHODS: 61 patients were examined, whose ocular axial lenght ranged between 24.51 mm and 26.72 mm. Preoperatively, the IOL power for each patient was calculated using six different formulas (SRK II, SRK/T, Binkhorst, Hoffer Q, Holladay 1, and Haigis). The power of the actually implanted IOL was based on Holladay 1 formula. Visual acuity was measured using Snellen chart on the 30th postoperative day.
RESULTS: 54 patients (88.5%) achieved full visual acuity (1.0 on Snellen chart) after cataract surgery. If other power calculation formulas were used for the actual IOL, this would be achieved respectively in: SRK/T - 39 patients (63.9%), Hoffer O - 22 patients (36.1%), Binkhorst - 21 patients (34.4%), Haigis - 7 patients (11.5%), SRK II - 5 patients (8.2%).
CONCLUSIONS: 1. Holladay 1 formula is recommended for intraocular lens power calculation for eyes of axial length exceeding 24.5 mm. 2. SRK/T formula also seems to be satisfactory for these cases.