研究目的
To analyze the short-term clinical and topographic outcomes in patients with keratoconus after corneal collagen cross-linking treatment with dextran-free isotonic riboflavin solution.
研究成果
CXL with dextran-free isotonic riboflavin solution is safe and effective for keratoconus, showing significant improvements in visual acuity, keratometry, and corneal thickness over 6 months. However, longer-term studies are needed to confirm these outcomes and compare with standard treatments.
研究不足
The study has a small number of subjects (26 eyes), lacks a control group treated with standard dextran-containing riboflavin solution, and has a short follow-up period of only 6 months, which may not capture long-term effects.
1:Experimental Design and Method Selection:
A retrospective case series design was used to study 26 eyes from 26 patients with progressive keratoconus. The CXL procedure involved mechanical debridement of the corneal epithelium, application of dextran-free isotonic riboflavin solution, and UVA irradiation.
2:Sample Selection and Data Sources:
Patients were selected based on inclusion criteria such as documented progression of keratoconus, corneal thickness ≥400 μm, age ≥18 years, and exclusion criteria like corneal opacity or previous surgery. Data were collected from clinical evaluations at Necmettin Erbakan University Meram Faculty of Medicine.
3:List of Experimental Equipment and Materials:
Equipment included a UVA light source (CCL-VAR?O; Peschke Meditrade GmbH), ultrasound pachymeter (OcuScan RxP; Alcon Laboratories, Inc.), corneal topographer (Pentacam; Oculus GmbH), and materials like riboflavin solution (MedioCROSS M), topical anesthetic (Alcaine; Alcon Pharmaceuticals), bandage contact lens (PureVision; Bausch & Lomb), and eyedrops (levofloxacin and dexamethasone).
4:Experimental Procedures and Operational Workflow:
Under sterile conditions, the corneal epithelium was removed, riboflavin solution was applied every 3 minutes for 30 minutes, followed by UVA irradiation for 30 minutes with continued riboflavin application. Pachymetry measurements were taken at specified intervals. Postoperative care included bandage lens and medication until epithelial healing.
5:Data Analysis Methods:
Statistical analysis used the Friedman two-way analysis of variance test with Bonferroni correction; p<0.0083 was considered significant. Data were normally distributed per Kolmogorov-Smirnov test.
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OcuScan RxP
ultrasound pachymeter
Alcon Laboratories, Inc.
Used to measure corneal thickness during the procedure.
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Alcaine
0.5% propacaine drops
Alcon Pharmaceuticals
Used as a topical anesthetic during the CXL procedure.
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MedioCROSS M
dextran-free isotonic riboflavin solution
Kiel, Germany (likely a manufacturer, but not specified as a brand; using the provided location)
Applied to the cornea as a photosensitizer for crosslink induction and to protect underlying tissues during UVA irradiation.
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CCL-VAR?O
UVA light source
Peschke Meditrade GmbH
Used to apply UVA irradiation to the cornea during the CXL procedure.
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Pentacam
corneal topographer
Oculus GmbH
Used for corneal topography measurements preoperatively and postoperatively.
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PureVision
bandage contact lens
Bausch & Lomb
Placed postoperatively to protect the cornea until epithelial healing is complete.
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