Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy
AIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems (WAVSs). METHODS: We explored the effectiveness of the coating with ophthalmic viscoelastic device (OVDs) on the corneal surface and the soaking the objec...
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doaj-72420786d9574fcd8829a6d3d26e92cf2020-11-24T21:52:09ZengPress of International Journal of Ophthalmology (IJO PRESS)International Journal of Ophthalmology2222-39592227-48982018-11-0111111809181310.18240/ijo.2018.11.12Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomyJung Pil Lee0Jinsoo Kim1Inwon Park2Ho Ra3Soonil Kwon4Department of Ophthalmology, Incheon Medical Center, Incheon 22532, Republic of KoreaDepartment of Ophthalmology, Hallym University Sacred Heart Hospital, Anyang 14068, Republic of KoreaDepartment of Ophthalmology, Hallym University Sacred Heart Hospital, Anyang 14068, Republic of KoreaDepartment of Ophthalmology, Bucheon St.Mary's Hospital, Bucheon, College of Medicine, the Catholic University of Korea, Seoul 14647, Republic of KoreaDepartment of Ophthalmology, Hallym University Sacred Heart Hospital, Anyang 14068, Republic of KoreaAIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems (WAVSs). METHODS: We explored the effectiveness of the coating with ophthalmic viscoelastic device (OVDs) on the corneal surface and the soaking the objective lens in warm-saline for preventing condensation of objective lens. First, to find the optimal soaking time to keep the objective lens warm, we measured the temperature of objective lens every minute after soaking in warm saline. Second, to find optimal distance between cornea and objective lens, which provide as wide a view as possible and less condensation at the same time, we measured the condensation time with different distances. With the obtained optimal soaking time and distance, we explored the effect of coating cornea with OVDs and soaking objective lens in warm saline on condensation time. RESULTS: One and 5min of soaking in warm saline was most effective for keeping the lens warm enough (45.1℃±2.1℃ for 1min and 46.4℃±1.0℃ for 5min, P=0.109). The mean condensation times for the control group at 1, 3, and 5 mm from corneal surface to objective lens were 1±0.4, 4±1.4, 190±26.1s, respectively, thus 5 mm was most optimal distance for vitrectomy with WAVSs. For the OVD coating group, the mean condensation times were 1.5±0.3, 13±1.4, and 200±23.9s at 1, 3, and 5 mm distance and borderline significant compared with control group (P=0.068, 0.051, and 0.063, respectively). With the 1-minute warm saline soaking group, the mean condensation time were extended to 188±34.4, 416±65.7, and 600±121.3s at 1, 3, and 5 mm distance and statistically significant compared with control (P=0.043, 0.041 and 0.043, respectively). CONCLUSION: OVD coating on corneal surface shows no difference on condensation time with control group. However, soaking the objective lens in warm saline revealed statistically significant extension of condensation time compared to control group. Therefore, keeping the objective lens warm with soaking in warm saline is a simple but effective to prevent condensation of objective lens during vitrectomy. The thermodynamics between objective lens and cornea during vitrectomy warrants further investigation.http://www.ijo.cn/en_publish/2018/11/20181112.pdfcondensationvitrectomywarm salinewide-angle viewing systems |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jung Pil Lee Jinsoo Kim Inwon Park Ho Ra Soonil Kwon |
spellingShingle |
Jung Pil Lee Jinsoo Kim Inwon Park Ho Ra Soonil Kwon Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy International Journal of Ophthalmology condensation vitrectomy warm saline wide-angle viewing systems |
author_facet |
Jung Pil Lee Jinsoo Kim Inwon Park Ho Ra Soonil Kwon |
author_sort |
Jung Pil Lee |
title |
Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
title_short |
Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
title_full |
Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
title_fullStr |
Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
title_full_unstemmed |
Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
title_sort |
preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy |
publisher |
Press of International Journal of Ophthalmology (IJO PRESS) |
series |
International Journal of Ophthalmology |
issn |
2222-3959 2227-4898 |
publishDate |
2018-11-01 |
description |
AIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems (WAVSs).
METHODS: We explored the effectiveness of the coating with ophthalmic viscoelastic device (OVDs) on the corneal surface and the soaking the objective lens in warm-saline for preventing condensation of objective lens. First, to find the optimal soaking time to keep the objective lens warm, we measured the temperature of objective lens every minute after soaking in warm saline. Second, to find optimal distance between cornea and objective lens, which provide as wide a view as possible and less condensation at the same time, we measured the condensation time with different distances. With the obtained optimal soaking time and distance, we explored the effect of coating cornea with OVDs and soaking objective lens in warm saline on condensation time.
RESULTS: One and 5min of soaking in warm saline was most effective for keeping the lens warm enough (45.1℃±2.1℃ for 1min and 46.4℃±1.0℃ for 5min, P=0.109). The mean condensation times for the control group at 1, 3, and 5 mm from corneal surface to objective lens were 1±0.4, 4±1.4, 190±26.1s, respectively, thus 5 mm was most optimal distance for vitrectomy with WAVSs. For the OVD coating group, the mean condensation times were 1.5±0.3, 13±1.4, and 200±23.9s at 1, 3, and 5 mm distance and borderline significant compared with control group (P=0.068, 0.051, and 0.063, respectively). With the 1-minute warm saline soaking group, the mean condensation time were extended to 188±34.4, 416±65.7, and 600±121.3s at 1, 3, and 5 mm distance and statistically significant compared with control (P=0.043, 0.041 and 0.043, respectively).
CONCLUSION: OVD coating on corneal surface shows no difference on condensation time with control group. However, soaking the objective lens in warm saline revealed statistically significant extension of condensation time compared to control group. Therefore, keeping the objective lens warm with soaking in warm saline is a simple but effective to prevent condensation of objective lens during vitrectomy. The thermodynamics between objective lens and cornea during vitrectomy warrants further investigation. |
topic |
condensation vitrectomy warm saline wide-angle viewing systems |
url |
http://www.ijo.cn/en_publish/2018/11/20181112.pdf |
work_keys_str_mv |
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