Abstract
Purpose: The present study was conducted to evaluate and compare the accuracy of refractive prediction by different intraocular lens power calculating formulas in hyperopes. Methods: This study reviewed 100 eyes of 100 patients who had received cataract extraction with posterior chamber intraocular lens (IOL) implantation using different IOL calculating formulas. The postoperative refractive spherical equivalent (SE)of different IOL calculating formulas (SRK/T, Holladay, Hoffer-Q, and Haigis) was calculated and compared. The SE at different axial lengths (AL) were compared and percentage of postoperative SE value for each formula was calculated at ±0.5D and ±1.00D. Results: Among the 100 eyes analysed, it was found that haigis formula had the lowest postoperative refractive SE, followed by hoffer-Q and holladay. SRK/T had highest SE. Postoperative SE was positively correlated with AL. Conclusion: Haigis formula rendered the lowest predictive postoperative refractive error compared with holladay, hoffer-Q and SRK/T. Thus, haiges formula may be regarded as a more reliable formula for hyperopes.
Highlights
Obtaining accuracy in intraocular lens power (IOL) calculation is relatively easy in eyes with an axial length between 22 and 26 mm with normal range corneas
Eom et al showed that the Haigis formula becomes more accurate than the Hoffer Q in short eyes as the Anterior chamber depth (ACD) gets shallower than 2.40 mm [1]
The present study evaluated the impact of Axial length (AL), Anterior chamber depth (ACD) and Corneal power(K) on predictability of intraocular lens (IOL) power calculation [6]
Summary
Obtaining accuracy in intraocular lens power (IOL) calculation is relatively easy in eyes with an axial length between 22 and 26 mm with normal range (unoperated) corneas. Many studies have shown excellent accuracy of the Haigis formula in all ranges of eyes, Manuscript received: 20th October 2019 Reviewed: 30th October 2019 Author Corrected: 8th November 2019 Accepted for Publication: 16th November 2019 including short eyes. Eom et al showed that the Haigis formula becomes more accurate than the Hoffer Q in short eyes as the ACD gets shallower than 2.40 mm [1]. It has been considered that IOL calculation formulas (SRK/T, Hoffer Q, Holladay 1, and Haigis) were more accurate for eyes with normal AL, but do not have the same level of postoperative refraction outcome for eyes with short AL [1]
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