Development of a Validated Chart for Intermediate Vision Assessment

Democritus University of Thrace400 enrolled

Overview

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.

Study Type

OBSERVATIONAL

Enrollment

400

Conditions

Myopia Hyperopia Presbyopia Astigmatism

Interventions

Intermediate Visual acuity (IVA) assessmentOTHER

Intermediate visual acuity (IVA) will be assessed with the Intermediate Visual acuity chart which 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

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * native Greek participants or foreigners with perfect knowledge (verbal and written) of Greek language Exclusion Criteria: * glaucoma or suspicion for glaucoma, * corneal disease or suspicion for corneal disease * fundus disease or suspicion for fundus disease * pregnancy or nursing, * underlying autoimmune disease * mental or neurologic disease

Locations (1)

Eye Institute Of thrace

Alexandroupoli, Evros, Greece

RECRUITING

Outcomes

Primary Outcomes

Intermediate Visual Acuity (IVA)

Number of participants that their intermediate visual acuity measured with the "intermediate visual acuity chart" will be statistically correlated with distant visual acuity (measured by 20/20 chart) and near visual acuity (measured by Jaeger chart)

Time frame: 6 months

Central Contacts

Georgios Labiris, MD, PhD

CONTACT

00302551039891 labiris@usa.net

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.