Development of a Validated Chart for Intermediate Vision Assessment
概览
- 阶段
- 不适用
- 干预措施
- 未指定
- 疾病 / 适应症
- Myopia
- 发起方
- Democritus University of Thrace
- 入组人数
- 400
- 试验地点
- 1
- 主要终点
- Intermediate Visual Acuity (IVA)
- 最后更新
- 11年前
概览
简要总结
Development of a validated computer-based instrument (software program) for the assessment of intermediate visual acuity.
详细描述
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.
研究者
Georgios Labiris
Assistant Professor
Democritus University of Thrace
入排标准
入选标准
- •native Greek participants or foreigners with perfect knowledge (verbal and written) of Greek language
排除标准
- •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
结局指标
主要结局
Intermediate Visual Acuity (IVA)
时间窗: 6 months
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)