A Comparison of the Accuracy of Toric Intraocular Lens Formulas

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

172 participants

Study Classification

OBSERVATIONAL

Study Start Date

2015-01-31

Study Completion Date

2020-01-31

Brief Summary

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To compare the accuracy of the Abulafia-Koch, the Barrett, the Barrett Post ,the EVO , the new Holladay with total surgical-induced astigmatism, the Kane and and the Næser-Savini toric intraocular lens (IOL) power formulas using a large database of toric IOL refractive outcomes

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Detailed Description

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To compare the accuracy of the Abulafia-Koch, the Barrett, the Barrett Post ,the EVO , the new Holladay with total surgical-induced astigmatism, the Kane and and the Næser-Savini toric intraocular lens (IOL) power formulas using a large database of toric IOL refractive outcomes.Retrospective consecutive case series.One hundred seventy-two eyes of 172 patients who had a toric IOL inserted during surgery.One eligible eye from patients having uncomplicated cataract surgery with insertion of an Alcon SN6AT(2-9) IOL (Alcon Laboratories, Inc, Fort Worth, TX) from 1 surgeon were included in the study. pre-operative were measured using either the IOLMaster 500 or 700 (Carl Zeiss Meditec AG, Jena, Germany). Using vector calculation, the predicted postoperative refractive astigmatism was calculated for each formula. This was compared with the actual postoperative refractive astigmatism to give the prediction error.

Conditions

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Astigmatism

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

RETROSPECTIVE

Study Groups

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Group 1

group 1 includes patients who axial length(AL)\<26mm

No interventions assigned to this group

Group 2

group 2 includes patients who axial length（AL）≥26mm

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

* uncomplicated cataract surgery with a temporal clear corneal incision,with preoperative biometry using either the IOLMaster 500 (softwareversions 5.5 and 7.7) or 700 (software version 1.50; Carl Zeiss Meditec AG, Jena, Germany)
* subjective manifest refraction performed by any of the orthoptists in the practice and measurement of the actual postoperative axis of the IOL alignment performed in the same visit an average of 1 or 3months after surgery.

Exclusion Criteria

* any corneal disease (keratoconus, other ectasia, pterygium, or previous trauma);
* previous ophthalmic operations, including laser vision correction, vitrectomy, pterygium surgery, penetrating glaucoma surgery, or scleral buckling procedures
* intraoperative or postoperative complications
* postoperative corrected distance visual acuity worse than 6/9

Minimum Eligible Age

21 Years

Maximum Eligible Age

90 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No