Related Experiment Video
Updated: Jun 13, 2026

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
Published on: November 12, 2015
The effect of the YK lens in keratoconus
Young Seok Kang1, Young Kee Park, Jong Soo Lee
1Noblesse Plastic Surgery Clinic, Pusan, Korea.
Purpose:
To report the clinical results of the use of the YK contact lens (Lucid Co., Seoul, Korea) for keratoconus.
Methods:
One hundred and twenty nine keratoconic eyes were fitted with a YK lens which has one base curve and three peripheral curves. A light feather touch fluorescein pattern was obtained based on topographic indices. Visual acuity, comfort, mean wearing time, and ocular tissue changes were evaluated. Mean follow up was 17.5 +/- 13.8 months (range 6-75).
Results:
One hundred and twenty six (97.6%) eyes tolerated the contact lenses. A total of 94.5% of the eyes achieved a visual acuity of 20/40 or better (average 0.79 +/- 0.21), and flatter base curve radius (BCR) was related to better visual acuity. One hundred and seventeen (90.7%) eyes reported that the lenses were comfortable. Mean wearing time was 12.1 h per day (range 4-18). Changes in keratometric values were not significant between baseline and final follow-up visit.
Conclusions:
The YK lens can provide successful visual outcome, with comfort, and no significant influence on the progression of keratoconus.
Related Concept Videos
Focusing of Light in the Eye
Angle Closure Glaucoma: Treatment
Open Angle Glaucoma: Treatment
Drugs such as carbonic anhydrase inhibitors, α2- and...