Objective:
To discuss higher-order aberrations (HOAs) associated with keratoconus and evaluate the efficacy of contact lenses in correcting these aberrations.
Approach:
- Historical Context: The article traces the development of wavefront-guided optics from early telescopes to modern aberrometers.
- Detection of HOAs: It highlights the advancements in corneal tomography and wavefront aberrometry for early detection of keratoconus.
- Contact Lens Correction: The article reviews the use of various contact lenses, including GP and scleral lenses, for correcting HOAs.
Key Findings:
- HOAs significantly affect visual acuity in keratoconus patients.
- Coma is the most prevalent HOA in keratoconus, with vertical coma being particularly distinguishing.
- Wavefront-guided surfaces can be applied to contact lenses to correct visually significant HOAs.
Interpretation:
The article discusses the detection and management of HOAs in keratoconus.
Limitations:
- The efficacy of soft lenses in correcting HOAs is generally inferior to GP lenses, particularly in cases of severe keratoconus.
- HOAs are highly dependent on pupil size, which may affect the outcomes of lens correction.
Conclusion:
The article presents cases demonstrating successful HOA reduction using scleral lenses.
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