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Filed Under
Cataract
Refractive
intraoperative aberrometry
intraoperative wavefront aberrometry
post-refractive surgery
refractive outcomes
IOL power calculation
ORA
IOLMaster
Barrett formula
2020 paper presentation
Purpose
To compare accuracy of current intraocular lens (IOL) power calculation formulas with intraoperative wavefront aberrometry in eyes with history of radial keratotomy (RK).
Methods
A retrospective comparative case-control series of 18 eyes with history of prior RK (study) and 36 age-matched nonrefractive eyes (control). All eyes underwent intraoperative biometry using the Optiwave Refractive Analysis (ORA) (Alcon, Fort Worth, TX, USA) and pre-op biometry using IOL Master (Carl Zeiss Meditec, Inc., Dublin CA, USA) between April 2015 and September 2019. IOL power was also calculated using the ASCRS post keratorefractive online calculator (http://iolcalc.ascrs.org). Comparison between ORA-recommended, ASCRS recommended, Barrett True K, and IOL implanted was conducted in the study group.
Results
There was no statistically significant difference between ORA recommended, ASCRS average, and Barrett True K (all p>0.182). Mean ORA-recommended was significantly higher than IOL implanted (22.13 vs. 22.83 diopters, p=0.013). In contrast, there was not statistically significant difference between mean IOL implanted and ASCRS average (p=0.501) or Barrett True K (p=0.792). Compared to the controls (study vs. control) there was no difference in ORA predicted error or post-operative SEQ (all p>194). The difference in ORA recommended (22.1 vs. 19.4 diopters, p<0.01) and difference between ORA recommended and IOL implanted (0.694 vs. 0.107, p=0.04) were statistically significant between groups.
Conclusion
Pre-op ASCRS post-refractive formula, Barrett True K, and ORA are helpful in determining IOL power in eyes with prior RK.
To compare accuracy of current intraocular lens (IOL) power calculation formulas with intraoperative wavefront aberrometry in eyes with history of radial keratotomy (RK).
Methods
A retrospective comparative case-control series of 18 eyes with history of prior RK (study) and 36 age-matched nonrefractive eyes (control). All eyes underwent intraoperative biometry using the Optiwave Refractive Analysis (ORA) (Alcon, Fort Worth, TX, USA) and pre-op biometry using IOL Master (Carl Zeiss Meditec, Inc., Dublin CA, USA) between April 2015 and September 2019. IOL power was also calculated using the ASCRS post keratorefractive online calculator (http://iolcalc.ascrs.org). Comparison between ORA-recommended, ASCRS recommended, Barrett True K, and IOL implanted was conducted in the study group.
Results
There was no statistically significant difference between ORA recommended, ASCRS average, and Barrett True K (all p>0.182). Mean ORA-recommended was significantly higher than IOL implanted (22.13 vs. 22.83 diopters, p=0.013). In contrast, there was not statistically significant difference between mean IOL implanted and ASCRS average (p=0.501) or Barrett True K (p=0.792). Compared to the controls (study vs. control) there was no difference in ORA predicted error or post-operative SEQ (all p>194). The difference in ORA recommended (22.1 vs. 19.4 diopters, p<0.01) and difference between ORA recommended and IOL implanted (0.694 vs. 0.107, p=0.04) were statistically significant between groups.
Conclusion
Pre-op ASCRS post-refractive formula, Barrett True K, and ORA are helpful in determining IOL power in eyes with prior RK.
View More Presentations from this Session
This presentation is from the session "SPS-110 Post Refractive Surgery - IOL Calculations" from the 2020 ASCRS Virtual Annual Meeting held on May 16-17, 2020.