Table1 Frequency and percentage of causes(略)
Table 2 Frequency and percentage of causes according to age of patients(略)
Table 3 Duration from the time of injury to the initial treatment(略)
Table 4 Frequency and percentage of final visual acuity according to type of trauma(略)
Table 5 Frequency and percentage of final result of surgery(略)
Most patients were admitted to hospital 624 hours after eye injury in our study, while there was also an interval of longer than 3 hours (mean time) from injury to hospital admission in the study of Karaman et al[17]. This is important because immediate and appropriate intervention with modern microsurgical techniques in visionthreatening emergencies can reduce longterm visual loss, and functional vision salvage rate could be 60%70%[18].
In our study all of patients required surgery and 24.2% of patients needed enucleation, which is similar to the result in the study of Smith et al[14] (28% enucleation) on 390 cases of penetrating eye injuries, whereas in a study in Greece just 42.5% of patients needed operation and only 1% required enucleation[19]. In the studies by Smith et al[20] and Kuhn
et al[21], the enucleation rates were reported to be 12% and 14.1% respectively, whereas in the study of Karaman et al[17] there was not any eyes enucleated. This difference indicates types of case selection. We chose severe traumatic eye injuries and also severe eye injuries were common in our society, which may be due to the poor control of industrial use of protective eyewear. Light perception (LP) to 20/200 in 24%, 20/200 or better in 38% of 384 patients with penetrating eye injuries, and poor visual outcome associated with poor initial visual acuity and delayed presentation have also been shown in the study of Smith et al[14].
In our study the initial vision was a predictor of the final visual outcome. In the study by De Juan et al[5], they found that an initial visual acuity<0.025 remained the same or worsened in 72% of the patients, whereas an initial visual acuity>0.025 remained unchanged or improved in 96% of the patients. Poor initial visual acuity as an associated factor with visual impairment (visual acuity less than 6/18) has been concluded in a study on prognostic factors of ocular injuries in South India[22].
In conclusion, according to our results of investigation, ocular trauma remains an important cause of preventable, mostly monocular, visual impairment and blindness. To decide on the prognostic factors in ocular trauma, initial visual acuity is the most important factor associated with final visual acuity in patients with ocular injury.
Acknowledgment We give our thanks to Dr Mohammad Hasan Lotfi from health college for his kindly help for statistical analysis in this paper.
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