Gleason William, Tanaka Hidenari, Albright Roger A, Cavanagh H Dwight
Menicon, Ltd. Nagoya, Japan.
Eye Contact Lens. 2003 Jan;29(1):2-9. doi: 10.1097/00140068-200301000-00002.
To establish the safety and efficacy of clinical performance of a novel hyper-O2-transmitting rigid gas-permeable (RGP) lens (tisilfocon A) worn continuously for 30 days (29 nights) equivalent to a conventional control hydrogel lens (etafilcon A) worn for 7 days (6 nights).
The study was a prospective, open-label, 24-center, concurrent cohort-controlled clinical trial.
Outcome measures included rates of adverse events, slitlamp findings, length of wear achieved, lens-corrected visual acuity, corneal refractive changes, dryness, and lens deposits.
The RGP lens wear test was equivalent or superior to the hydrogel control performance in all categories. Two-thirds (66.5%) of patients wearing the RGP lens achieved continuous wear periods greater than 22 nights; and 60.4% achieved more than 28 nights of continuous use. There was a statistically significant lower rate of adverse events, considered definitely related to lens wear, for the RGP test lens versus the hydrogel control (none vs. 2.2%; P = 0.007, Fisher's exact two-sided test).
Continuous wear of the tisilfocon A (Menicon Z, Menicon Co., Ltd., Nagoya, Japan) RGP lens for up to 30 nights is a safe and equivalent alternative to 7-day (6-night) hydrogel wear.
