Midday Fogging in Scleral Lens Wearers: Causes and Clinical Associations
Overview
Midday fogging, characterized by debris in the fluid reservoir of scleral lenses, affects over half of habitual wearers and can impair visual quality. Key factors associated with fogging include front-surface nonwetting and diffuse haze, while lens fit characteristics appear unrelated.
Background
Midday fogging is a common phenomenon in scleral lens wearers, involving accumulation of debris in the fluid reservoir beneath the lens. This condition can cause visual blur and discomfort, impacting patient satisfaction and lens wear success. Understanding the contributing factors is essential for optimizing lens fit and care. Previous studies have explored associations with lens design, care products, and ocular surface inflammation.
Data Highlights
| Parameter | Association with Fogging |
|---|---|
| Fogging prevalence | 58% (28 of 48 participants) |
| Scleral lens fit characteristics | No significant difference between fogging and non-fogging eyes |
| Front-surface nonwetting | Significantly more common in eyes with fogging |
| Diffuse fluid reservoir haze | Significantly more common in eyes with fogging |
Key Findings
- Midday fogging was reported by 58% of habitual scleral lens wearers in the study.
- No substantial differences in scleral lens fit parameters were found between eyes with and without fogging.
- Front-surface nonwetting was significantly associated with the presence of fogging.
- Diffuse haze within the fluid reservoir was also significantly linked to fogging symptoms.
- Midday fogging is not related to specific lens designs or care products.
- Ocular surface inflammation may contribute to fogging, as suggested by elevated inflammatory mediators and associated redness or irritation.
Clinical Implications
Clinicians should consider evaluating front-surface wettability and fluid reservoir clarity when managing patients reporting midday fogging. Since lens fit parameters are not predictive, focus on optimizing lens surface properties and addressing ocular surface inflammation may improve patient comfort and visual quality. Awareness that fogging is not linked to lens design or care products can guide targeted interventions.
Conclusion
Midday fogging in scleral lens wearers is primarily associated with front-surface nonwetting and diffuse fluid reservoir haze rather than lens fit characteristics. Addressing these factors and ocular surface inflammation may reduce fogging and enhance visual outcomes.
References
- Barnett et al. 2021 -- CLEAR – scleral lenses
- Fogt et al. 2025 -- Slit lamp findings in scleral lens wearers with and without subjective fogging
- Postnikoff et al. 2019 -- Identification of leukocytes associated with midday fogging
- Schornack et al. 2020 -- Factors associated with patient-reported midday fogging
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