Clinical Scorecard: When the Answer Isn’t Clear: The Power of Comprehensive Data in Clinical Decision-Making

At a Glance

Key Highlights

• Comprehensive diagnostic data, including epithelial mapping via OCT, is critical for accurate assessment of corneal thickness and keratoconus progression.
• Corneal crosslinking is effective in halting progression but requires a minimum post-debridement stromal thickness of 400 µm to prevent endothelial damage.
• Preoperative corneal clarity and densitometry predict the risk of postoperative corneal haze and scarring, influencing surgical decision-making.

Guideline-Based Recommendations

Diagnosis

• Use corneal tomography and epithelial mapping (OCT/OCT-A) to assess corneal thinning, steepening, and epithelial remodeling.
• Monitor for progression defined by ≥1 D keratometry steepening, 2%-5% thinning at the thinnest point, ≥-0.50 D refractive shift, or ≥1 line BCVA reduction within 1 year.

Management

• Indicate epithelial-off corneal crosslinking for progressive keratoconus meeting progression criteria.
• Confirm post-epithelial debridement stromal thickness ≥400 µm before ultraviolet irradiation; use hypotonic riboflavin to induce stromal swelling if thickness is less.
• Consider risks of surgery carefully in cases with extreme corneal thinning (<300 µm stromal thickness) and significant baseline corneal haze or scarring.

Monitoring & Follow-up

• Perform routine corneal tomography to detect progression and epithelial remodeling.
• Assess corneal clarity preoperatively to predict risk of postoperative haze.
• Use epithelial mapping to understand residual stromal bed thickness prior to surgery.

Risks

• Iatrogenic endothelial damage if stromal thickness is insufficient during crosslinking.
• Postoperative corneal haze and scarring, especially in eyes with preoperative corneal opacity.
• Limited data on safety and outcomes in corneas thinner than 300 µm.

Patient & Prescribing Data

Adolescents and patients with progressive keratoconus exhibiting corneal thinning and steepening

Treatment decisions should be individualized based on comprehensive imaging data, including epithelial thickness and stromal bed measurements, to ensure safety and efficacy of corneal crosslinking.

Clinical Best Practices

• Increase diagnostic testing and data collection in ambiguous clinical cases to guide shared decision-making.
• Utilize advanced imaging modalities such as OCT epithelial mapping to accurately measure stromal thickness and epithelial remodeling.
• Confirm adequate stromal thickness intraoperatively before UV irradiation to prevent endothelial damage.
• Consider corneal clarity and preoperative densitometry to assess risk of postoperative haze and counsel patients accordingly.
• Recognize that keratoconus progression criteria should be applied within a defined time frame (commonly 1 year) but monitor closely for rapid changes.

References

• Corneal crosslinking impact on keratoconus prognosis
• Progression criteria for corneal ectasia
• Corneal swelling rates with hypotonic riboflavin
• Safety data limitations in corneas <300 µm
• Epithelial remodeling in early keratoconus
• Corneal haze as a complication of crosslinking
• Preoperative densitometry predicting haze risk