The Effect of Trephination on Corneal Topography

Autor:	David S. Greenfield, Shafiq Q Jivanjee, Michael B. Raizman
Rok vydání:	1995
Předmět:	genetic structures Keratometer Corneal curvature medicine.diagnostic_test Corneal asphericity business.industry Anatomy Curvature Corneal topography eye diseases Radius of curvature (optics) law.invention medicine.anatomical_structure law Cornea medicine sense organs business Corneal epithelium
Zdroj:	Ophthalmic Surgery, Lasers and Imaging Retina. 26:560-567
ISSN:	2325-8179 2325-8160
DOI:	10.3928/1542-8877-19951101-11
Popis:	* BACKGROUND AND OBJECTIVE: A prospective study was performed to assess the effect of trephination on corneal curvature. * MATERIALS AND METHODS: Thirty-seven fresh porcine globes with intact corneal epithelium were used. Radius of curvature, central dioptric power, and powers and axes of the steepest and flattest meridians were obtained using a vertically mounted computerized videokeratography unit. Following 8-mm vacuum trephination of the central donor corneas, the said parameters were reassessed on the resultant buttons. No globes with epithelial defects were included in the study. * RESULTS: The mean corneal radius of curvature (mm) increased from 8.68 ± 0.79 to 10.46 ± 3.24 (P = .005), the central dioptric power (D) decreased from 39.36 ± 3.84 to 36.31 ± 10.15 (P = .08), and the total corneal asphericity (D) increased from 5.03 ± 2.99 to 7.47 ± 3.42 (P = .0001). No significant changes in the axes of the steepest and the flattest meridians were noted following trephination. * CONCLUSION: Trephination leads to significant corneal flattening and increased asphericity. Cornea! topography can be used successfully as a research tool for whole globes and trephined buttons. [Ophthalmic Surg Lasers 1995;26:560-567.]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e45f98d35a9a978cc8234dcf5fb0affe https://doi.org/10.3928/1542-8877-19951101-11 Zobrazit plný text záznamu