Myopia Clinical Trial
Official title:
Development of a Validated Chart for Intermediate Vision Assessment
Development of a validated computer-based instrument (software program) for the assessment of intermediate visual acuity.
Development of a validated computer-based instrument (software program) for the assessment
of intermediate visual acuity (IVA). It is known that no validated method for the evaluation
of IVA exists.
Primary objective of the study is to validate a specific computer-based chart (optotype)
that will enable: a) comparative studies among different groups of presbyopic patients with
refractive errors (ie. myopia, hyperopia, and/or astigmatism), and, b) assessment of the
efficacy of surgical refractive procedures (ie. LASIK) on presbyopic patients.
Intermediate Visual acuity chart is similar to the prevalent Jaeger chart. It consists of
short blocks of text in various type sizes.The computer screen is set at a specific reading
distance (1 meter) and the patient is asked to read the passage with the smallest type
he/she can see. According to the smallest text he/she can read, IVA is classified from IVA1
(which is considered the equivalent of 20/20 distance visual acuity) to IVA5
Validation of the computer-based IVA chart will be done by correlating the results of the
IVA chart to the corresponding ones from the validated 20/20 distant and Jaeger near visual
acuity charts, in a random sample of study participants with different refractive errors and
different near and distant visual acuities.
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Time Perspective: Cross-Sectional
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