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목적 : In this study, we investigated the effects of soaking objective lens into warm saline for preventing condensation during vitrectomy with noncontact wide-angle viewing systems(WAVs).
방법 : Four experiments were performed with a noncontact WAVs. First, we explored the condensation time according to the distance between cornea and objective lens. Second, after coating the dispersive ophthalmic viscoelastic devices (OVDs) on cornea surface, we rechecked the condensation time in the same manner. Third, we repeated experiment after soaking the objective lens in warm saline. Before 3rd experiment, to determine the optimal soaking time, we checked the temperature changes after soaking lens for 1, 5, 10, 15,and 20 minutes.
결과 : The difference in temperature of the lenses in both groups (soaked for 1 and 5 minutes each) is not statistically significant. There was no difference in the condensation time between control and OVDs coating group at 1, 3 and 5mm distance from the corneal surface (P = .068, P = .051 and P= .063 respectively). However, the condensation time of the 1 minute warm saline soaking group was higher than that of the control at 1, 3 and 5mm distance from the corneal surface (P = .043, P = .041 and P= .043 respectively).
결론 : 5 mm is relatively the optimal distance between the lens and the corneal surface. And OVDs-coated lens was not much effective in delaying condensation time while warm saline soaked lens proved to be cost-effective and simple to get clear surgical view for a long enough time.
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