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[Clinical characteristics of mechanical ocular injury and application of ocular trauma score].

OBJECTIVE
To summarize clinical characteristics of mechanical ocular injury and to analyze the role of ocular trauma score (OTS) in the estimation of final visual acuity.


METHODS
All cases of ocular trauma admitted to the Department of Ophthalmology from January 2009 to December 2010 were retrospectively reviewed. Data extracted included laterality of the injured eye, gender, age, presenting time, cause, ocular trauma classification, initial and final visual acuity. These injuries were classified by ocular trauma classification system (OTCS). We also used the OTS in evaluating the final visual outcome. Comparisons between groups for discontinuous variables were analyzed using rank-sum test. Rank correlation was used in analysis between initial visual acuity and final visual acuity or between final visual acuity and OTS. Chi-square test was used to analyze variables, such as age, cause, type and visual acuity. Comparison of ages between male and female was analyzed by using t-test.


RESULTS
Of the 168 eyes, there were 106 open globe injury (OGI) and 62 closed globe injury (CGI). There were 140 males (85.71%) and 22 females (14.29%). Presenting time median of OGI and CGI was 5 h and 10 h respectively, and there was significant difference between these two different injuries (Z = -2.547, P = 0.011). The high-risk age group was the young age group (100 eyes, 59.52%), vs. the middle age group (46 eyes, 27.38%) and the elder age group (22 eyes, 13.10%). Occupation-related injury (70 eyes) was the most common cause and mainly resulted in OGI (54/70). Initial and final visual acuities in CGI were better than those of OGI (χ(2) = 37.847, P = 0.000; χ(2) = 44.428, P = 0.000). Initial visual acuity was correlated with final visual acuity (r = 0.858, P = 0.000). Final visual acuity was significantly correlated with total score (r = 0.870, P = 0.000) and OTS (r = 0.869, P = 0.000).


CONCLUSIONS
In this group of mechanical ocular trauma patients, male is more common than the female. Main type of injury is OGI and presenting time of OGI is earlier than that of CGI. The high-risk age group is the young. Main cause of injury is occupation-related injury. Initial and final visual acuities in CGI are better than those in OGI. OTS calculated at initial examination may be a useful parameter for the estimation of prognosis.