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[Normal value of the central corneal thickness measured by non-contact specular microscope]. 2004

Qin Wu, and Xuanchu Duan, and Youqin Jiang, and Guoping Qing, and Bing Jiang, and Jingming Shi
Department of Ophthalmology, The Second Xiang ya Hospital of Central South University, Changsha 410011, China.

OBJECTIVE To get the normal value of the central corneal thickness (CCT) measured by non-contact specular microscope and to approach relatively influenced factor from different aspects. METHODS The CCT was determined by the KONAN non-contact specular microscope. 173 normal subjects (322 eyes) were measured to get a normal value of the CCT. In the meantime, the para-central corneal thickness (12 o'clock, 2 o'clock, 10 o'clock, 6 o'clock) were measured and the corneal endothelial cell was analyzed in using the same machine. The statistical analysis was performed in using PC SPSS version 10.0 under windows system. RESULTS Measured by the non-contact specular microscope, the mean value of the CCT in normal eyes is (554.78+/-32.61), microm. There was no significant difference between right eyes and left eyes, and between male and female. There is no linear correlation between age, density and average area of the corneal endothelium cell and the CCT. The peripherial corneal thickness is thicker than the CCT. Among the peripherial corneal thickness, the thickest part is in the position of 12 o'clock,while the thinnest part is in the position of 6 o'clock. CONCLUSIONS The CCT can be accurately measured by non-contact specular microscope. The measured value is reliable.

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
D012016 Reference Values The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality. Normal Range,Normal Values,Reference Ranges,Normal Ranges,Normal Value,Range, Normal,Range, Reference,Ranges, Normal,Ranges, Reference,Reference Range,Reference Value,Value, Normal,Value, Reference,Values, Normal,Values, Reference
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
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
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293 Adolescent A person 13 to 18 years of age. Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths

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