Clinical Scorecard: Preserving a Failing Penetrating Keratoplasty Graft
At a Glance
| Category | Detail |
|---|---|
| Condition | Failing penetrating keratoplasty (PK) graft with endothelial cell failure and graft decompensation |
| Key Mechanisms | Endothelial decompensation causing corneal edema, stromal haze, and irregular astigmatism; oxygen delivery to cornea critical to reduce edema and support graft viability |
| Target Population | Patients with compromised corneas post-penetrating keratoplasty experiencing graft failure |
| Care Setting | Specialized ophthalmic care involving cornea specialists and contact lens practitioners |
Key Highlights
- Use of customized scleral lenses fabricated from high Dk (oxygen permeability) materials improves oxygen delivery to stressed corneas.
- Oblate lens designs with toric peripheral curves and customized edge lifts optimize fit on irregular post-PK corneas, enhancing comfort and lens stability.
- Improved oxygen permeability and surface wettability contribute to reduced corneal edema, enhanced visual acuity, and prolonged graft viability.
Guideline-Based Recommendations
Diagnosis
- Assess visual acuity decline and symptoms such as glare and photophobia in post-PK patients.
- Perform slit lamp examination to identify stromal haze, epithelial microcystic edema, and corneal thickening.
- Use corneal tomography to confirm central edema, posterior float elevation, and irregular astigmatism.
Management
- Select scleral lenses made from hyper-Dk materials to maximize oxygen delivery to the compromised cornea.
- Customize lens design (e.g., oblate shape, toric peripheral curves, edge lift zones) to accommodate irregular corneal topography and optimize scleral alignment.
- Coordinate care with cornea specialists and consider concurrent topical therapies.
Monitoring & Follow-up
- Evaluate lens fit for central clearance without corneal bearing and ensure stable peripheral landing.
- Monitor visual acuity improvements and subjective symptom relief (e.g., glare, fluctuating vision).
- Repeat corneal tomography to assess changes in corneal thickness and epithelial contour.
Risks
- Inadequate oxygen permeability may exacerbate corneal edema and graft failure.
- Poor lens fit can cause localized compression, discomfort, and reduced lens wear tolerance.
- Midday fogging may reduce visual performance and require lens design modifications.
Patient & Prescribing Data
68-year-old female with failing PK graft and endothelial decompensation
Transitioning to a high Dk scleral lens with customized design improved BCVA from hand motion to 20/150, reduced corneal edema, and enhanced lens wear tolerance and visual stability.
Clinical Best Practices
- Prioritize oxygen permeability in scleral lens material selection for compromised corneas.
- Customize lens parameters to address irregular corneal shapes and optimize scleral alignment.
- Regularly assess lens fit and corneal health to guide iterative lens modifications.
- Collaborate closely with cornea specialists for comprehensive management of graft failure.
References
- Corneal tomography and scleral lens fitting in post-PK eyes
- Oxygen permeability importance in scleral lenses for compromised corneas
- Clinical management of endothelial decompensation with scleral lenses
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