Contact Lenses: Applying AS-OCT…
Anterior segment (AS)-OCT is proving to be an equally important tool in the evaluation of the ocular surface and in the fitting and management of specialty contact lenses.
Clinical Scorecard: Contact Lenses: Applying AS-OCT
At a Glance
Category Detail
Condition Ocular Surface Evaluation and Specialty Contact Lens Fitting Key Mechanisms Utilization of Anterior Segment Optical Coherence Tomography (AS-OCT) for imaging and measurement of tear meniscus and corneal parameters. Target Population Patients requiring specialty contact lenses, including those with dry eye disease and keratoconus. Care Setting Specialty contact lens practice and optometry clinics.
Key Highlights
AS-OCT measures tear meniscus height and area, aiding in dry eye disease assessment. It provides precise corneal imaging for early detection of keratoconus. AS-OCT is beneficial for fitting all types of rigid contact lenses, especially scleral lenses. Measurements of corneal vault and limbal clearance are critical for successful lens fitting. Comparative readings between AS-OCT and Scheimpflug-based imaging are reliable but should not be used interchangeably. Guideline-Based Recommendations
Diagnosis
Use AS-OCT to evaluate tear meniscus for dry eye disease diagnosis. Employ AS-OCT for early detection and assessment of keratoconus. Management
Utilize AS-OCT for fitting and evaluating specialty contact lenses. Adjust lens fitting based on AS-OCT measurements of corneal clearance and edge alignment. Monitoring & Follow-up
Capture AS-OCT images at initial fitting and follow-up after lens wear to assess fit and clearance. Risks
Avoid using AS-OCT and Scheimpflug imaging interchangeably due to differences in keratometry readings. Patient & Prescribing Data
Patients with dry eye disease and those requiring specialty contact lenses.
AS-OCT enhances the fitting process by providing detailed measurements necessary for optimal lens performance.
Clinical Best Practices
Ensure a minimum of 150 μm corneal clearance and 60 to 80 μm limbal clearance when fitting lenses. Assess lens fit by capturing images in different gaze directions to identify impingement or lifting. References
