Page 32 - The Indian Optician Digital Edition November-December 2021
P. 32
ORTHO-K “Based on the control of AL elongation in high myopic
AND AXIAL eyes and the reduction in the AL differences between
two eyes in most subjects, Ortho-K lenses seem to be
ELONGATION more effective than 0.01% atropine over a treatment
STUDY period of one year,” the researchers concluded.
Researchers in China PATIENTS WITH BINOCULAR
recently conducted a study VISION DISORDERS LIKELY TO
to find out if axial length (AL)
increases by the same extent DROP OUT OF CL WEAR
in eyes treated bilaterally with
orthokeratology (Ortho-K) or As per a new study conducted at the School of Optometry
administration of 0.01% atropine and Vision Science, University of New South Wales, Sydney,
as they wanted to find a better Australia, patients with binocular vision disorders are more
way to lessen the axial length prone to drop out of contact lens wear.
differences between both
eyes in children with myopic The researchers examined 76 dry eye patients while
anisometropia. wearing their habitual CLs. After a comprehensive binocular
vision assessment, the study team measured symptoms of CL
The study involved discomfort and binocular vision disorders with the Contact
95 children with myopic Lens Dry Eye Questionnaire-8 (CLDEQ-8) and Convergence
anisometropia who used Insufficiency Syndrome Survey (CISS), respectively. Furthermore,
ortho-K lenses (n=49) or 0.01% the study also measured CL dissatisfaction from CL discomfort
atropine eye drops (n=46). Once and binocular vision disorders with the Ocular Surface Disease
the Ortho-K lenses were given, Index (OSDI) on the basis of reported correlations with the
the children were asked to wear CLDEQ-8 and CISS. The patients were classified in terms of CL
them every night for at least discomfort (≥12 on CLDEQ-8) and binocular vision discomfort.
eight consecutive hours. In the The researchers were able to confirm that binocular vision
atropine group, the children
were required to wear single- disorders can contribute to CL dissatisfaction independently
vision spectacle lenses for full of CL discomfort. They noted that patients with CL discomfort
correction with the highest showed a higher proportion of Meibomian gland dysfunction,
positive/least negative power shorter fluorescein tear break-up time and noticeably less
consistent with the optimum comfortable wearing times.
visual acuity and to administer They further revealed that those diagnosed with binocular
one drop of 0.01% atropine in vision disorders scored higher than those without disorders
both eyes once before bedtime for the OSDI (25.1 vs. 10.7) and CISS (18.7 vs. 11.9) but not the
every night. CLDEQ-8. Those categorised as having CL discomfort scored
higher than those categorised as having no CL discomfort
The study results showed for the OSDI (19.0 vs. 9.3) and CISS (16.1 vs. 11.0). There were no
that Ortho-K decreases the significant interactions between binocular vision status and CL
AL differences between both comfort status for any questionnaire.
eyes, whereas administration
of 0.01% atropine does not. As the highest mean score on OSDI was achieved in those
They also found that Ortho-K with both a binocular vision disorder and CL discomfort, they
lenses were more effective than researchers believe that the effect on CL dissatisfaction may
0.01% atropine in controlling be additive when both conditions are present. They thus
AL elongation in the eyes with concluded that dissatisfied CL wearers should have a binocular
high myopia after one-year of vision workup to determine whether a vision disorder is
follow-up. contributing to CL dissatisfaction or not.
| NOV-DEC 2021 | 28 CONTACT LENS NEWS
