| Purpose:
|
| To compare the initial comfort response
to a range of currently marketed
soft contact lenses |
| Method: |
| Fifteen subjects participated
in a single blind study. Each of the following lenses was
worn monocularly for a period of 10 minutes: PureVision T (PV),
Focus ® Night & DayT (ND), Focus ® Dailies ® (FD),
1 DAY ACUVUE ® (AD) Proclear ® (PC) together with
Silsoft ® (SE) as a positive control. Both the order
of insertion and the wearing eye were chosen at random. Contralateral
eyes remained without lenses throughout. Lenses were thoroughly
rinsed with sterile saline prior to insertion. Standardised
insertion technique was used and no more than 2 lens types
were inserted in any one day. Subjects rated the subjective
comfort of each lens relative to the control eye which was
arbitrarily anchored at a value of 100. Ratings were obtained
immediately after insertion, and after 1, 5 an 10 minutes
of wear. Repeated measures ANOVA was applied. |
| Results: |
| There were no significant
differences in comfort ratings between the ND, PV, AD, FD
and PC lenses (p > 0.05). However, the SE lens was significantly
less comfortable than the other lenses (p< 0.005). The
comfort rating averaged across time was: FD:86 ± 11,
PC:84 ± 13, ND:82 ± 11, PV:79 ± 12,
AD:77 ± 16, SE:25 ± 20 . The comfort ratings
did not differ over time for any of the lens types (p=0.2).
On average there was a 4 point (range 1 to 8 points) difference
between insertion and 10 minute ratings. |
| Conclusion: |
| Under the conditions
of this experiment initial comfort ratings do not differ
for a range of soft contact lenses. This suggests that the perception of
comfort during the first few moments of wear may depend on factors other
than lens design or material characteristics. |
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