title: Relationships between central and peripheral corneal thickness in different degrees of myopia.
abstract: OBJECTIVE
  To analyze the relationship between the central corneal thickness (CCT) and mid-peripheral corneal thickness (PCT) with the degree of myopia [axial length (AL) and spherical equivalent refractive error (SE)].
  
  
  METHODS
  175 right myopic eyes from 175 patients were divided according to the degree of SE: group #1 (n=76, <6.00 D), group #2 (n=72, between 6.00 and 12.00 D) and group #3 (n=27, >12.00 D). The CCT and PCT (3mm from the apex to the superior, inferior, nasal and temporal locations) were measured with the Orbscan-II. Relative peripheral index (RPI) was calculated by dividing the PCT by the CCT. The AL was measured with the IOL Master, and the SE was obtained with subjective refraction.
  
  
  RESULTS
  AL was 25.18±1.16 mm, 26.59±1.26 mm and 29.45±2.58 mm and SE was -3.31±1.40 D, -8.32±1.64 D and -16.44±4.48 D for groups #1, #2 and #3, respectively. Non-statistically significant differences in central and peripheral corneal thickness were found between groups (P>0.05 ANOVA). Non-significant relationship was found between central and peripheral corneal thickness with the AL and SE in the three study groups and in the total sample (r<0.24; P>0.05). The RPI values were similar between groups without significant difference between groups (P>0.05 ANOVA). Linear relationship was found between RPI superior location in group #2 (r=-0.23; P=0.04) and RPI nasal location in group #3 with the EE (r=0.41; P=0.03).
  
  
  CONCLUSIONS
  There are no significant differences among low, moderate and extremely myopic eyes related to the CCT and PCT. Corneal thickness is very similar in myopic eyes with small differences that are not clinically relevant to myopic patient management.
authors.affiliation: Optometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, Spain.
authors.forename: Sara
authors.initials: S
authors.lastname: Ortiz
authors.affiliation: Optometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Mena
authors.affiliation: Optometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Rio-San Cristobal
authors.affiliation: Optometry Research Group, IOBA-Eye Institute, University of Valladolid, Valladolid, Spain; Department of Physics TAO, School of Optometry, University of Valladolid, Valladolid, Spain. Electronic address: raul@ioba.med.uva.es.
authors.forename: Raul
authors.initials: R
authors.lastname: Martin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D058452:Axial Length, Eye / Q000473:pathology; D003315:Cornea / Q000473:pathology*; D063171:Corneal Pachymetry; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000473:pathology* / Q000503:physiopathology; D012029:Refraction, Ocular / Q000502:physiology; D055815:Young Adult
keywords: Axial length; Central corneal thickness; Espesor corneal central; Espesor corneal periférico; Longitud axial; Miopía; Myopia; Peripheral corneal thickness; Relative peripheral index; Índice periférico relativo