TY - JOUR T1 - Time course of conjunctival hyperemia induced by omidenepag isopropyl ophthalmic solution 0.002%: a pilot, comparative study versus ripasudil 0.4% JF - BMJ Open Ophthalmology JO - BMJ Open Ophth DO - 10.1136/bmjophth-2020-000538 VL - 5 IS - 1 SP - e000538 AU - Etsuko Terao AU - Shunsuke Nakakura AU - Yasuko Fujisawa AU - Yuki Nagata AU - Kanae Ueda AU - Yui Kobayashi AU - Satomi Oogi AU - Saki Dote AU - Miku Shiraishi AU - Hitoshi Tabuchi AU - Tsuyoshi Yoneda AU - Atsuki Fukushima AU - Ryo Asaoka AU - Yoshiaki Kiuchi Y1 - 2020/07/01 UR - http://bmjophth.bmj.com/content/5/1/e000538.abstract N2 - Objective We investigated the detailed time course of conjunctival hyperemia induced by omidenepag isopropyl ophthalmic solution 0.002% (omidenepag), a selective prostaglandin E2 receptor 2 agonist.Methods and analysis We recruited 34 healthy subjects and administered omidenepag in the right eye and ripasudil 0.4% in the left eye. We evaluated conjunctival hyperemia using slit-lamp photography at baseline and after 15, 30, 60, 120, 180 and 360 min. The conjunctival hyperemia score was graded by three independent observers using a scale from 0 (none) to 3 (severe). We also evaluated conjunctival hyperemia by the pixel coverage of conjunctival blood vessels (per cent coverage) determined using a conjunctival hyperemia-analysing software.Results In omidenepag, the conjunctival hyperemia score and per cent coverage peaked at both 30 min (mean score±SD: 1.57±0.67 and 11.90%±3.66%, respectively) and then gradually decreased at 60 min (10.79%±3.32%) and 120 min (1.10±0.52) when they reached a level that was not significantly different from the baseline values. For ripasudil 0.4%, the peak time of the conjunctival hyperemia score and per cent coverage were both at 15 min (score: 2.42±0.54 and 15.26%±3.38%). The degree of conjunctival hyperemia was significantly higher for ripasudil 0.4% than that for omidenepag from 15 to 30 min in both the conjunctival hyperemia score and per cent coverage (p<0.007 by Bonferroni correction).Conclusion Conjunctival hyperemia induced by omidenepag gradually peaks to moderate severity, though weaker compared with that induced by ripasudil 0.4%, and subsides relatively quickly. ER -