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B. J. OBerg, D. A. Sediq, K. S. Bower, C. D. Coe, B. C. Rimm; Blast Exposure Effect on Corneal Structure and Biomechanics. Invest. Ophthalmol. Vis. Sci. 2009;50(13):1755.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the effect of blast exposure on the corneal structure and biomechanics in uninjured eyes of soldiers who suffered blast trauma to the fellow eye.
Retrospective, non-comparative case series of soldiers with unilateral ocular blast trauma. Various parameters of corneal structure, biomechanics, and visual function were measured serially to include corneal hysteresis (CH), corneal resistance factor (CRF), cornea compensated and Goldmann correlated intraocular pressure (IOPcc and IOPg, respectively) by the Ocular Response Analyzer (Reichert Ophthalmic Instruments Inc., Depew, NY); anterior (AC) and posterior (PC) corneal curvature, and anterior chamber depth (ACD) by Orbscan IIz (Bausch & Lomb, Rochester NY); nasal and temporal AC angles, ACD, and average central corneal thickness (CCT) 0-2mm, 2-5 mm, 5-7 mm, and 7-10 mm by anterior segment OCT (VisanteTM Carl Zeiss Meditec, Dublin, CA); and best spectacle corrected high contrast visual acuity (BSCVA). BSCVA was converted to logMAR for analysis. Statistical testing consisted of paired sample t-tests and Wilcoxon signed ranks test to determine if there was a significant difference between the initial and final visits. A p-value < 0.05 was considered statistically significant.
10 eyes/soldiers mean age 28.8 ± 8.2 yrs (range 22-48) were screened initially at a mean of 167.4 days post injury (range 9-600) and again at a mean of 426.0 days post injury (range 214-938). Improvised explosive devices (IED) were the primary cause of blast exposure (n=9) followed by rocket-propelled grenades (RPG) (n=1). There were no significant changes between initial and final visits for BSCVA (LogMAR -0.043 ± 0.093 vs. -0.078 ± 0.08, p=0.38), corneal curvature, ACD, CCT, AC angles, CH, CRF, or IOPcc (see Figure 1). The final IOPg decreased when compared to the initial exam (P= 0.038).
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