Development of a Validated Chart for Intermediate Vision Assessment
NCT ID: NCT02279446
Last Updated: 2014-10-31
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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UNKNOWN
400 participants
OBSERVATIONAL
2014-10-31
2015-04-30
Brief Summary
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Detailed Description
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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.
Conditions
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Study Design
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CROSS_SECTIONAL
Study Groups
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20/20ND group
This group will have 20/20 visual acuity both in distant and near.
Intermediate Visual acuity (IVA) assessment
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
20/20D group
This group will have 20/20 distant visual acuity and variable near visual acuity.
Intermediate Visual acuity (IVA) assessment
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
20/20N group
This group will have 20/20 near visual acuity and variable distant visual acuity.
Intermediate Visual acuity (IVA) assessment
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
s20/20ND group
This group will have variable near and distant visual acuity (both less than 20/20)
Intermediate Visual acuity (IVA) assessment
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
Interventions
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Intermediate Visual acuity (IVA) assessment
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 Criteria
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Inclusion Criteria
Exclusion Criteria
* corneal disease or suspicion for corneal disease
* fundus disease or suspicion for fundus disease
* pregnancy or nursing,
* underlying autoimmune disease
* mental or neurologic disease
18 Years
ALL
Yes
Sponsors
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Democritus University of Thrace
OTHER
Responsible Party
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Georgios Labiris
Assistant Professor
Principal Investigators
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Georgios Labiris, MD, PhD
Role: STUDY_DIRECTOR
Assistant Professor
Locations
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Eye Institute Of thrace
Alexandroupoli, Evros, Greece
Countries
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Central Contacts
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Other Identifiers
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263/13-10-2014
Identifier Type: -
Identifier Source: org_study_id