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Dongchul Choi, Soonil Kwon, Inwon Park, Jung Pil Lee, Joo Yeon Lee; Novel clinical method for preventing condensation in noncontact wide-angle viewing systems. Invest. Ophthalmol. Vis. Sci. 2016;57(12):5817.
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© ARVO (1962-2015); The Authors (2016-present)
To compare the effects of a soaking objective lens into warm saline and a corneal coating with ophthalmic viscoelastic devices (OVDs) for preventing condensation during vitrectomy with noncontact wide-angle viewing systems (WAVs).
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.
The difference in temperature of the lenses soaked for 1 and 5 minutes was not statistically significant. On the other hand, the lenses soaked for 10, 15 and 20 minutes showed statistically significant difference compared with the lenses soaked for 1 minute in the saline. 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).
A corneal coating with OVDs was not much effective in delaying condensation time while warm saline soaked lens proved to be simple and effective to get clear surgical view for a long enough time.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
Experimet Method : distance between cornea and objective lens
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