Central Corneal Thickness in Northwestern American Indians/Alaskan Natives and Comparison with White and African-American Persons

Rodrigo J. Torres, Emily Jones, Lorna (Beth) Edmunds, Thomas Becker, George A. Cioffi, Steven L. Mansberger

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Abstract

Purpose: To determine the demographic factors associated with central corneal thickness (CCT) in Northwestern American Indians/Alaskan Natives (AI/ANs) and to compare these CCT measurements with those of White and African-American persons. Design: Cross-sectional comparative, observational study. Methods: We performed ultrasonic pachymetry (DGH-500 Pachette; DGH Technologies, Exton, Pennsylvania, USA) on a random sample of AI/AN subjects from three randomly selected AI/AN tribes in the Northwest United States (n = 429). Pachymetry also was performed on a convenience sample of White (n = 46) and African-American (n = 33) persons. Our main outcome measure was the average of right and left eye CCT. Results: Average AI/AN CCT was 554.8 ± 33.9 μm. AI/AN CCT was found to be thicker than that of African Americans (528.5 ± 33.2 μm) but similar to that of White persons (551.9 ± 28.3 μm). CCT was greater in AI/AN females than in AI/AN males (557.6 ± 33.3 μm vs 550.1 ± 34.5 μm; P = .03). We found no difference in CCT based on percent AI/AN heritage, age, and keratometry readings. We found no significant differences in mean CCT between AI/ANs with glaucoma (556.2 μm) and those who did not have glaucoma (556.6 μm). Conclusions: CCT measurements for the Northwest AI/AN population are similar to those of White persons but thicker than those of African-American persons. Although glaucoma is common in AI/ANs, we did not find an association with thin CCT. We need future studies to explore the risk factors for glaucoma in AI/ANs.

Original languageEnglish (US)
JournalAmerican Journal of Ophthalmology
Volume146
Issue number5
DOIs
StatePublished - Nov 2008

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North American Indians
Population Groups
African Americans
Glaucoma
Corneal Pachymetry
Ultrasonics
Observational Studies
Reading
Demography
Outcome Assessment (Health Care)

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Central Corneal Thickness in Northwestern American Indians/Alaskan Natives and Comparison with White and African-American Persons. / Torres, Rodrigo J.; Jones, Emily; Edmunds, Lorna (Beth); Becker, Thomas; Cioffi, George A.; Mansberger, Steven L.

In: American Journal of Ophthalmology, Vol. 146, No. 5, 11.2008.

Research output: Contribution to journalArticle

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N2 - Purpose: To determine the demographic factors associated with central corneal thickness (CCT) in Northwestern American Indians/Alaskan Natives (AI/ANs) and to compare these CCT measurements with those of White and African-American persons. Design: Cross-sectional comparative, observational study. Methods: We performed ultrasonic pachymetry (DGH-500 Pachette; DGH Technologies, Exton, Pennsylvania, USA) on a random sample of AI/AN subjects from three randomly selected AI/AN tribes in the Northwest United States (n = 429). Pachymetry also was performed on a convenience sample of White (n = 46) and African-American (n = 33) persons. Our main outcome measure was the average of right and left eye CCT. Results: Average AI/AN CCT was 554.8 ± 33.9 μm. AI/AN CCT was found to be thicker than that of African Americans (528.5 ± 33.2 μm) but similar to that of White persons (551.9 ± 28.3 μm). CCT was greater in AI/AN females than in AI/AN males (557.6 ± 33.3 μm vs 550.1 ± 34.5 μm; P = .03). We found no difference in CCT based on percent AI/AN heritage, age, and keratometry readings. We found no significant differences in mean CCT between AI/ANs with glaucoma (556.2 μm) and those who did not have glaucoma (556.6 μm). Conclusions: CCT measurements for the Northwest AI/AN population are similar to those of White persons but thicker than those of African-American persons. Although glaucoma is common in AI/ANs, we did not find an association with thin CCT. We need future studies to explore the risk factors for glaucoma in AI/ANs.

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