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Filed Under
Cataract
IOLs & Calculations
Refractive
post-refractive surgery
refractive outcomes
IOL power calculation
Barrett formula
2020 paper presentation
Purpose
To report the accuracy of refractive outcomes after phakoemulsification when biometry was taken using a Placido-based optical biometer (Aladdin) and Barrett True K / True K toric formulae were used for IOL calculation in eyes that had prior corneal laser refractive surgery.
Methods
A retrospective review of refractive outcomes in 7 eyes that underwent phakoemulsification + IOL implantation between March & October 2019. Inclusion criteria were eyes that had previous corneal refractive surgery and either significant cataract or refractive error. Biometry was taken using the Aladdin Placido disc optical biometer, and IOL calculation was undertaken using the Barrett True K and True K Toric formulae (which are integrated into the Aladdin biometer). Surgeries were performed by a single surgeon using a 2.2mm corneal incision with IOL placement in the capsular bag. Final refraction was performed no earlier than 4 weeks post-operatively. Patients received a variety of IOL types
Results
Two eyes, that each received a multifocal IOL, were within +/- 0.25D of the pre-operative target. Unaided visual acuity was 20/16 for distance and J2 for near in each eye. One eye, that received a monofocal IOL, was within +/- 0.5D of the pre-operative target and unaided distance visual acuity was 20/20. Results from other eyes remain to be entered. Informal review of the IOL powers that would have been chosen if other formulae had been used showed that a lower level of refractive outcome accuracy would have been achieved.
Conclusion
Patients that had prior corneal laser refractive surgery often have high expectations for the visual result of cataract / RLE surgery, and frequently elect for premium IOLs Planning IOL implant surgery using the Aladdin biometer and Barrett True K / True K Toric formulae results in a high level of refractive outcome accuracy & patient satisfaction
To report the accuracy of refractive outcomes after phakoemulsification when biometry was taken using a Placido-based optical biometer (Aladdin) and Barrett True K / True K toric formulae were used for IOL calculation in eyes that had prior corneal laser refractive surgery.
Methods
A retrospective review of refractive outcomes in 7 eyes that underwent phakoemulsification + IOL implantation between March & October 2019. Inclusion criteria were eyes that had previous corneal refractive surgery and either significant cataract or refractive error. Biometry was taken using the Aladdin Placido disc optical biometer, and IOL calculation was undertaken using the Barrett True K and True K Toric formulae (which are integrated into the Aladdin biometer). Surgeries were performed by a single surgeon using a 2.2mm corneal incision with IOL placement in the capsular bag. Final refraction was performed no earlier than 4 weeks post-operatively. Patients received a variety of IOL types
Results
Two eyes, that each received a multifocal IOL, were within +/- 0.25D of the pre-operative target. Unaided visual acuity was 20/16 for distance and J2 for near in each eye. One eye, that received a monofocal IOL, was within +/- 0.5D of the pre-operative target and unaided distance visual acuity was 20/20. Results from other eyes remain to be entered. Informal review of the IOL powers that would have been chosen if other formulae had been used showed that a lower level of refractive outcome accuracy would have been achieved.
Conclusion
Patients that had prior corneal laser refractive surgery often have high expectations for the visual result of cataract / RLE surgery, and frequently elect for premium IOLs Planning IOL implant surgery using the Aladdin biometer and Barrett True K / True K Toric formulae results in a high level of refractive outcome accuracy & patient satisfaction
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.