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Risk factors for self-reported visual symptoms with Intacs inserts for myopia
Debby K Holmes-Higgin1, Terry E Burris, Jodi A Lapidus
1Northwest Corneal Services, Corneal Topography Research Center, 6950 SW Hampton, Suite 150, Portland, OR 97223, USA.
Ophthalmology
|January 5, 2002
Summary
Certain preoperative factors influence the likelihood of experiencing visual symptoms after Intacs inserts for myopia. Lower preoperative astigmatism and better uncorrected visual acuity may reduce symptom risk.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Surgery
Background:
- Intacs inserts are micro-thin prescription inserts used to correct myopia.
- Understanding risk factors for postoperative visual symptoms is crucial for patient counseling and outcomes.
Purpose of the Study:
- To evaluate potential risk factors and visual performance measures related to self-reported clinical visual symptoms after Intacs insertion for myopia.
Main Methods:
- Retrospective analysis of 263 participants from FDA phase III KeraVision clinical trials.
- Patients were classified into outcome groups based on self-reported symptoms or Intacs removal.
- Multivariate logistic regression analyzed differences in visual acuity, refractive error, corneal metrics, and demographics.
Main Results:
- Lower preoperative mean keratometry (>45 D), lower manifest refractive astigmatism (0.75-1.00 D), better uncorrected visual acuity, and soft contact lens wear were associated with fewer symptoms.
- Increased postoperative defocus equivalent (0.50 D increments) doubled the risk of symptoms.
- Worse preoperative uncorrected visual acuity and larger mesopic pupil diameter (≥6.5 mm) increased symptom likelihood.
Conclusions:
- Preoperative characteristics significantly influence the probability of reporting visual symptoms after Intacs implantation.
- Identifying these factors allows for better prediction and management of patient outcomes in refractive surgery.