Contact Lens SpectrumThe Essentials of GPs for Astigmatism

GP lenses can be a good option for patients with astigmatism who are looking for clear, stable vision.

Dive into the advantages of gas permeable (GP) lenses for astigmatism correction. Explore how fitting strategies and patient communication can lead to successful adaptation and superior visual outcomes.

Key Points:

• GP lenses offer excellent clarity and stability of vision for patients with moderate to high astigmatism, particularly in cases of with-the-rule (WTR) astigmatism​.
• Soft toric lenses can show instability with active head and eye movements, leading to lens mislocation and visual instability​.
• GP lenses are easy to fit, requiring only a good spectacle refraction and keratometry readings​.
• GP lens adaptation can be improved by using topical anesthetic at fitting and dispensing visits, leading to higher comfort and lower dropout rates​.
• Positive communication with the patient about the benefits of GP lenses can influence patient acceptance and success with these lenses​.
• There’s no physiological need for a build-up of lens tolerance; patients can wear the lenses as long as comfortable from the beginning​.

Additional Points:

• Patients with WTR refractive astigmatism between 1D and 2D with similar corneal plane refractive cylinder and keratometry readings difference are great candidates for a spherical GP fit​.
• The tear film behind the GP lens can help neutralize the astigmatism, especially in cases of WTR cornea​.
• When corneal astigmatism exceeds about 2.50D WTR, a bitoric lens option might be necessary. GP lenses can be more challenging for patients with against-the-rule (ATR) astigmatism, where soft toric options might be more appropriate​.
• Empirical fitting of GP lenses is almost risk-free due to the warranted or guaranteed fit policies of many GP laboratories, and Ks and a refraction are sufficient for lens design​.

Conclusion:

• Although GP lenses offer a promising solution for astigmatism management, the success of fitting these lenses hinges on accurate patient selection, effective communication about the benefits, and ensuring patient comfort during the adaptation period.

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