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Ultrasound biomicroscopy in refractive surgery
J McWhae1, A Willerscheidt, H Gimbel
1Department of Surgery, Foothills Hospital, Calgary, Alberta, Canada.
Journal of Cataract and Refractive Surgery
|September 1, 1994
Summary
Ultrasound biomicroscopy (UBM) shows potential for evaluating corneas after refractive surgery, particularly for epikeratophakia. While less effective for radial keratotomy and photorefractive keratectomy, UBM data approximated refractive power for PRK.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Medical Imaging
Background:
- Refractive surgery necessitates advanced corneal topography assessment methods.
- Ultrasound biomicroscopy (UBM) is a high-resolution imaging technique utilizing high-frequency transducers for corneal evaluation.
Purpose of the Study:
- To pilot the use of Ultrasound Biomicroscopy (UBM) for assessing corneal topography post-refractive surgery.
- To evaluate UBM's efficacy in visualizing corneal changes after various refractive surgical procedures.
Main Methods:
- A pilot study involving six patients with prior epikeratophakia, radial keratotomy, or photorefractive keratectomy.
- Examination using a 50 MHz ultrasound transducer for high-resolution corneal imaging.
Main Results:
- UBM provided clear imaging of the epigraft in patients who underwent epikeratophakia.
- Corneal imaging was less informative after radial keratotomy and photorefractive keratectomy.
- Computed corneal refractive power from UBM data for photorefractive keratectomy closely matched optical keratometry readings.
Conclusions:
- Ultrasound biomicroscopy demonstrates specific applications in analyzing corneal topography after certain refractive surgeries, notably epikeratophakia.
- Further research is warranted to optimize UBM's utility for post-refractive surgery assessment, especially for photorefractive keratectomy outcomes.
