Biomaterial Database

Corneal endothelial changes after excimer laser photorefractive keratectomy. 1993

S Amano, and K Shimizu

Division of Ophthalmology, Musashino Red Cross Hospital, Tokyo, Japan.

We used specular microscopy to investigate corneal endothelial changes after excimer laser photorefractive keratectomy. Twenty patients (26 eyes) underwent photorefractive keratectomy for the correction of myopia. The central cornea endothelium of each eye was observed preoperatively and one month postoperatively. Sixteen of the 26 eyes were examined by specular microscopy one year after photorefractive keratectomy. The corneal endothelial cell densities preoperatively, one month, and one year postoperatively were 3,221 +/- 216/mm2, 3,233 +/- 240/mm2, and 3,177 +/- 185/mm2 (mean +/- SD), respectively. The average coefficients of variation of mean cell area preoperatively and one month and one year postoperatively were 0.24 +/- 0.09, 0.23 +/- 0.05, and 0.22 +/- 0.05, respectively. There were no significant differences in mean cell density or the coefficients of variation of mean cell area among preoperative and one-month and one-year postoperative values. These results suggest that photorefractive keratectomy does not markedly affect the corneal endothelial cell density.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008853	Microscopy	The use of instrumentation and techniques for visualizing material and details that cannot be seen by the unaided eye. It is usually done by enlarging images, transmitted by light or electron beams, with optical or magnetic lenses that magnify the entire image field. With scanning microscopy, images are generated by collecting output from the specimen in a point-by-point fashion, on a magnified scale, as it is scanned by a narrow beam of light or electrons, a laser, a conductive probe, or a topographical probe.	Compound Microscopy,Hand-Held Microscopy,Light Microscopy,Optical Microscopy,Simple Microscopy,Hand Held Microscopy,Microscopy, Compound,Microscopy, Hand-Held,Microscopy, Light,Microscopy, Optical,Microscopy, Simple
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D009216	Myopia	A refractive error in which rays of light entering the EYE parallel to the optic axis are brought to a focus in front of the RETINA when accommodation (ACCOMMODATION, OCULAR) is relaxed. This results from an overly curved CORNEA or from the eyeball being too long from front to back. It is also called nearsightedness.	Nearsightedness,Myopias,Nearsightednesses
D002452	Cell Count	The number of CELLS of a specific kind, usually measured per unit volume or area of sample.	Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D003315	Cornea	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)	Corneas
D004728	Endothelium, Corneal	Single layer of large flattened cells covering the surface of the cornea.	Anterior Chamber Epithelium,Corneal Endothelium,Endothelium, Anterior Chamber,Epithelium, Anterior Chamber,Anterior Chamber Endothelium
D005260	Female		Females
D005500	Follow-Up Studies	Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.	Followup Studies,Follow Up Studies,Follow-Up Study,Followup Study,Studies, Follow-Up,Studies, Followup,Study, Follow-Up,Study, Followup
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man