THE OCULAR COMPONENTS IN EMMETROPIC CHILDREN AS A FUNCTION OF ETHNICITY

Title THE OCULAR COMPONENTS IN EMMETROPIC CHILDREN AS A FUNCTION OF ETHNICITY
Author, Co-Author Karla Zadnik, G. Lynn Mitchell, Donald O. Mutti, Lisa A. Jones, Ruth E. Manny, Robert N. Kleinstein, Julie A. Yu, CLEERE Study Group
Topic
Year
2002
Day
Friday
Program Number
Room
Room 1 SP
Affiliation
Abstract PURPOSE: To investigate eye size as a function of ethnicity in emmetropic, school-aged children.

METHODS: Children in grades 1–8 were recruited and examined during the 1997-98 academic year at four clinical sites. Children with cycloplegic autorefraction results between-0.50 D and +1.00 D in both principal meridians are considered emmetropic and are included in this dataset. Four ethnic groups were represented in this sample: African Americans (AA, n=272), Asians (A, n=112), Hispanics (H, n=83), and Whites (W, n=186). Refractive error, corneal curvature, crystalline lens parameters, and axial length were measured using cycloplegic autorefraction, autokeratometry, videophakometry, and A-scan ultrasonography. We preset the clinically significant differences for each of the ocular components and highlight differences between ethnic groups below that achieved both clinical and statistical significance (controlling for age, gender, and spherical equivalent refractive error).

RESULTS: Unadjusted means +/- SD; corneal curvature in D (vertical meridian): AA:43.91 +/- 1.67; A:44.30 +/- 1.46; H:43.48 +/- 1.74; W:44.08 +/- 1.42; Gullstrand lens power in D: AA:20.68 +/- 1.77; A:20.55 +/- 1.53; H:20.38 +/- 2.50; W:19.82 +/- 1.34; axial length in mm: AA:23.17 +/- 0.78; A:23.08 +/- 0.67; H:23.43 +/- 0.76; W: 23.16 +/- 0.66. Corneal curvature in emmetropic Hispanic children is significantly flatter compared to emmetropic Asian and White children (p=.0059). Emmetropic, African American children have steeper crystalline lenses than emmetropic, White children (p<0.0001). Emmetropic Hispanics have longer eyes than all other ethnic groups (p=.0018).


CONCLUSIONS: Emmetropic, Hispanic children have longer eyes compared to emmetropic, African-American, Asian, and White children and have flatter corneas compared to emmetropic, Asian and White children. Emmetropic, African-American children have steeper crystalline lenses than White children.

ADDITIONAL COMMENTS: Supported by NIH/NEI grants U10-EY08893 and R21-12273, the Ohio Lions Eye Research Foundation and the EF Wildermuth Foundation.
Affiliation of Co-Authors The Ohio State University, College of Optometry, The Ohio State University, College of Optometry, The Ohio State University, College of Optometry, The Ohio State University, College of Optometry, University of Alabama at Birmingham, School of Optometry, The Medical Center, Marshall B. Ketchum University, College of Optometry
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