Performance of Rigid Gas Permeable (RGP) Scleral Contact Lenses With a Passive Artificial Iris
Status:
Unknown status
Trial end date:
2020-12-01
Target enrollment:
Participant gender:
Summary
Data from 15 healthy subjects will be recorded in two testing sessions spread on two days,
using three lens designs (A, B and C). Before the measuring days, each subject will undergo
an extra fitting session of a large-diameter scleral contact lens on the dominant eye,
assessed by an experienced practitioner. The fitting data will be used to custom-make the
three lens designs for each subject, thus ensuring their comfort and safety during the days
of the experiments. During the experiment days baseline measurements will be obtained before
and after pupil dilation and contact lens wear. During the first testing session data from
the lens design A (reference lens without artificial iris) will be recorded. During the
second testing session data from the lens designs B and C (lenses with artificial iris with
different transmittances) will be recorded. In each testing session, contrast sensitivity and
visual acuity will be evaluated and non-invasive imaging measurements will be undertaken
(optical coherence tomography and slit lamp). A specific questionnaire will be given to the
subject to assess comfort, light sensitivity, the horizontal visual angle and overall
experience of the scleral lens and in combination with a pair of sunglasses category 3-4.