Visual recovery after corneal crosslinking for keratoconus: a 1-year follow-up study.
Summary of "Visual recovery after corneal crosslinking for keratoconus: a 1-year follow-up study."
To evaluate visual recovery and intraocular straylight in keratoconus patients 3 months and 1 year after corneal crosslinking (CXL) PATIENTS AND
Thirty-three eyes of 28 consecutive patients with mild to moderate keratoconus were included. The following were assessed at baseline, 3 months and 1 year after
corrected distance visual acuity (CDVA), intraocular straylight, spherical equivalent (SE), keratometry (Kmax and K min (Diopters D and axis), the regularity index and pachymetry. Changes from baseline were calculated using mixed linear regression models.
The CDVA remained unchanged 3 months after CXL (-0.003 (95 %
-0.038 to 0.044); p = 0.880) and improved after 1 year (-0.042 (95 %
-0.078 to -0.007; p = 0.021)). The mean straylight value increased significantly by 0.27 (95 %
0.18 to 0.35; p < 0.001) 3 months after CX and normalized to preoperative values after 1 year (0.06 (95 %
-0.03 to 0.14; p = 0.215)). SE improved from the mean preoperative value of -2.61 D (95 %
-3.83 to -1.39) by 1.95 (95 %
1.03 to 2.86; p < 0.001) at 3 months and remained stable at the 1-year follow-up visit (2.17 (95 %
1.21 to 3.12; p < 0.001)). Parameters of of keratometry changed only minimally. The regularity index remained almost unchanged at 3 months (2.45 (95 %
-4.97 to 9.88; p = 0.503)) and decreased by 6.97 (95 %
-14.08 to 0.14; p = 0.054). Pachymetry decreased by 44.0 μm (95 %
56.1 to 31.9; p < 0.001) at 3 months and almost returned to preoperative values at 12 months (-11.3 μm (95 %
-27.9 to 5.3; p = 0.175)).
In accordance with the decrease in CDVA and patients' complaints of disability due to glare, intraocular straylight increased 3 months after surgery. One year after CXL, there was an increase in CDVA due to an improved SE and regularity index, and intraocular straylight had normalized.
Eye Clinic, Cantonal Hospital of Lucerne, Lucerne, Switzerland, Ivo.Guber@ksw.ch.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22892583
- DOI: http://dx.doi.org/10.1007/s00417-012-2133-2
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Medical and Biotech [MESH] Definitions
The measurement of curvature and shape of the anterior surface of the cornea using techniques such as keratometry, keratoscopy, photokeratoscopy, profile photography, computer-assisted image processing and videokeratography. This measurement is often applied in the fitting of contact lenses and in diagnosing corneal diseases or corneal changes including keratoconus, which occur after keratotomy and keratoplasty.
Asymmetries in the topography and refractive index of the corneal surface that affect visual acuity.
A noninflammatory, usually bilateral protrusion of the cornea, the apex being displaced downward and nasally. It occurs most commonly in females at about puberty. The cause is unknown but hereditary factors may play a role. The -conus refers to the cone shape of the corneal protrusion. (From Dorland, 27th ed)
The transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous CORNEAL EPITHELIUM; BOWMAN MEMBRANE; CORNEAL STROMA; DESCEMET MEMBRANE; and mesenchymal CORNEAL ENDOTHELIUM. It serves as the first refracting medium of the eye. It is structurally continuous with the SCLERA, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the TRIGEMINAL NERVE via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (Cline et al., Dictionary of Visual Science, 4th ed)
New blood vessels originating from the corneal veins and extending from the limbus into the adjacent CORNEAL STROMA. Neovascularization in the superficial and/or deep corneal stroma is a sequel to numerous inflammatory diseases of the ocular anterior segment, such as TRACHOMA, viral interstitial KERATITIS, microbial KERATOCONJUNCTIVITIS, and the immune response elicited by CORNEAL TRANSPLANTATION.