Dry Eye Syndrome Clinical Trial
Official title:
Tears Substitutions and Their Effects on Higher Order Aberrometery
Hypothesis is that tear substitutions cause blur after they are instilled. The investigators will use aberrometry as a measurement over time after a tear formulation is used and try to determine if there are any measurable change in higher order aberrations between different tear formulations and how long it takes to return to pre-instillation measurements thus providing information on duration of the tear drop. 4 commercially available "dry eye" artificial tears formulations will be used and preservative saline will act as a control. The study will be conducted on subjects that do not have clinical evidence of dry eye syndrome to focus the data on the blur effects of the tear substitutions.
Once consent is obtained the subject will choose from available time slots. Each subject
will come to the UIHC Department of Ophthalmology at designated times for approximately one
hour on five different days, for a total time commitment of approximately 5 hours. Each
subject will receive the same 4 artificial tear substitutes and saline, one different drop
each day. One of the four tear substitutes (brands: Systane, Systane Ultra, Optive, and
Refresh) will be tested on each of the days. One drop will be used each day and the protocol
of each day will be the same, the only factor changing from day to day is the drop that is
being evaluated. On each study day, the subject will have a pre-instillation measurement of
their higher order aberrometry of each eye. One drop of the designated drop will be placed
into each of the eyes. Subsequent aberrometry measurements of each eye will be taken at
immediately post-instillation, 5 minutes, 30 minutes and 60 minutes post instillation. The
same protocol will be followed with a saline drop and thus each patient will act as a
control.
There is no long-term follow-up.
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