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Refractive predictability using two optical biometers and refraction types for intraocular lens power calculation in
Huanhuan Cheng1,2, Jianbing Li1, Bing Cheng1
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China.
International Ophthalmology
|April 17, 2020
Summary
Accurate intraocular lens (IOL) power calculation is crucial for cataract surgery. This study found good agreement between two biometry devices, with a slight edge for IOLMaster 700, and confirmed autorefraction accuracy is comparable to subjective refraction.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optical Sciences
Background:
- Accurate intraocular lens (IOL) power calculation is essential for achieving optimal visual outcomes after cataract surgery.
- Optical biometry devices are widely used for obtaining ocular measurements necessary for IOL power calculation.
- Variations in device performance and refraction assessment methods can impact the predictability of refractive outcomes.
Purpose of the Study:
- To compare the accuracy of IOL power calculations using two leading optical biometry devices: IOLMaster 700 and Lenstar 900.
- To evaluate the influence of different refraction types (autorefraction vs. subjective refraction) on IOL power calculation accuracy.
- To assess the performance of various established IOL power calculation formulas.
Main Methods:
- A prospective study involving 164 eyes of 164 patients undergoing cataract surgery with MX60 IOL implantation.
- Ocular biometric measurements were obtained using both IOLMaster 700 and Lenstar 900.
- Postoperative refraction was assessed using both autorefraction (OPD-Scan III) and subjective refraction in a subset of patients.
- The prediction error of eight different IOL power calculation formulas was analyzed and compared between devices and refraction types.
Main Results:
- High inter-device agreement was observed for key biometric parameters including axial length, keratometry, anterior chamber depth, lens thickness, and central corneal thickness.
- The IOLMaster 700 demonstrated significantly lower absolute prediction error compared to the Lenstar 900 for the Olsen, Haigis, and Hoffer Q formulas.
- No significant difference in prediction error was found between autorefraction and subjective refraction for any of the tested formulas.
Conclusions:
- Both IOLMaster 700 and Lenstar 900 provide reliable biometric measurements with excellent agreement.
- A trend towards superior refractive predictability was noted with the IOLMaster 700.
- Autorefraction using OPD-Scan III offers accuracy equivalent to subjective refraction for IOL power calculations.
