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Late changes in refraction, pachymetry, visual acuity, and corneal topography after penetrating keratoplasty
- Source :
- Cornea. 25(2)
- Publication Year :
- 2005
-
Abstract
- Purpose: To analyze the late changes in refraction, cornea topography, and pachymetry after penetrating keratoplasty. Methods: We have retrospectively analyzed data of 64 eyes of 56 patients with a clear corneal graft andno other ocular diseases. The eyes were examined soon and several years after all sutures were removed, at 19.5 ′ 3.1 months and 76.8 ′ 25.2 months, respectively, after keratoplasty. All eyes were examined using the EyeSys 2000 videokeratograph and the Tomey SP2000 ultrasonic pachymeter. Corneal surface regularity was studied using the indices provided by the Holladay Diagnostic Summary (ie, asphericity coefficient Q; comeal uniformity index CU; predicted corneal acuity PCA). Irregular astigmatism was quantified using semimeridian data from videokeratographs (refractive power symmetry index). Results: Visual acuity increased by an average of 0.35 ′ 0.93 lines (P = 0.002) between the 2 examinations, whereas no significant changes in refraction and videokeratoscopy (ie, power, indices, and irregular astigmatism) were observed (P ≥ 0.08). Central corneal thickness significantly increased from 542 ′ 31 μm to 572 ′ 38 μm (P < 0.001). Change in BSCVA did not significantly correlate with the change in refraction, in topographic indices, or in irregular astigmatism (r s ≤ 0.13; P ≥ 0.16). Conclusion: Late after penetrating keratoplasty, best corrected visual acuity shows a small but statistically significant improvement, whereas refraction and corneal surface regularity are stable. This late improvement in visual acuity is not explained by current techniques.
- Subjects :
- Adult
Male
medicine.medical_specialty
Visual acuity
genetic structures
Adolescent
Visual Acuity
Astigmatism
Refraction, Ocular
Corneal Diseases
Cornea
Optics
Ophthalmology
medicine
Humans
Corneal surface
Postoperative Period
Child
Aged
Retrospective Studies
Ultrasonography
Best corrected visual acuity
Aged, 80 and over
medicine.diagnostic_test
business.industry
Corneal Topography
Middle Aged
medicine.disease
Corneal topography
Refraction
eye diseases
medicine.anatomical_structure
Treatment Outcome
Female
sense organs
medicine.symptom
business
Symmetry index
Keratoplasty, Penetrating
Follow-Up Studies
Subjects
Details
- ISSN :
- 02773740
- Volume :
- 25
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Cornea
- Accession number :
- edsair.doi.dedup.....408df8f23d11e6c0197a998ff3c560fb