FITTING CHARACTERISTICS OF 1-DAY AND 14-DAY ACUVUE DISPOSABLE CONTACT-LENSES

The fitting characteristics of 1-day Acuvue disposable soft contact le nses (SCLs) [base curve (BC) 9.0 mm, diameter 14.2 mm] and 14-day Acuv ue disposable SCLs (BC 8.8 mm, diameter 14.0 mm) were evaluated and co mpared with respect to lens centration and post-blink movement in prim ary gaze and in upgaze. In this double-blind study 25 successful daily wearers of either the 1-day lens or the 14-day lens with the same par ameters were randomly fit with three 1-day lenses and three 14-day len ses for a total of 6 lenses per eye. The lens fit was evaluated 5 min after insertion. Lens centration was assessed by measuring temporal, n asal, superior and inferior limbal coverage, and then comparing the ne t horizontal centration (temporal minus nasal coverage) and the net ve rtical centration (superior minus inferior coverage) of the 1-day and 14-day lenses. There was no significant difference between the two len ses in terms of temporal, superior, and inferior limbal coverage (p > 0.05). However, the 1-day lens showed statistically more nasal coverag e (p < 0.05). No statistically significant. difference in movement or in horizontal and vertical differences in centration were found (p > 0 .05). Although our findings indicate a subtle statistical difference i n fitting characteristics, clinically the two lenses should provide si milar fits.