Development and Validation of a Computer-based Digital Near-vision Optotype Based on the Greek Version of the Print MNREAD.
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 100
- 试验地点
- 1
- 主要终点
- Accessibility Index (ACC)
研究概览
简要总结
Primary objective of our study is to develop and validate a computer-based digital near-vision optotype based on the Greek version of the print MNREAD.
详细描述
Present study aims to develop and validate a computer-based digital near-vision optotype based on the Greek version of the print MNREAD.
Specifically, it aims to evaluate the level of agreement between the conventional printed greek MNREAD chart and the corresponding digital chart, as well as test-retest reliability of the digital optotype.
To address these aims, four reading parameters measured with the print and the digital version are compared. These parameters are the following:
- Reading Acuity (RA)
- Maximum Reading Speed (MRS)
- Critical Print Size (CPS)
- Accessibility Index (ACC)
All the comparisons take place in two groups: a) a Normal Vision Group (NVG), and b) a Low Vision Group (LVG) in order to estimate the reading capacity in a population with a wide range of vision.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 75 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •adequate literacy of written Greek language
排除标准
- •attention-deficiency
- •former diagnosis of mental diseases
- •former diagnosis of psychiatric diseases
结局指标
主要结局
Accessibility Index (ACC)
时间窗: through study completion, an average of 8 months
The mean reading speed measured across the 10 largest print sizes (1.3 to 0.4 logMAR) of the MNREAD Acuity Chart at 40 cm normalized by 200 wpm, which was the mean value for a group of 365 normally sighted young adults aged 18 to 39 years old.
Reading Acuity (RA)
时间窗: through study completion, an average of 8 months
The smallest print that the patient can read without making significant errors, and can be calculated by the following formula: Acuity (in logMAR)= 1.4 - (sentences x 0.1) + (errors x 0.01).
Critical Print Size (CPS)
时间窗: through study completion, an average of 8 months
The smallest print size at which patients can read with their MRS, and is identified as the print size of the sentence fulfilling this criterion: all of the following sentences are read at a speed that is 1.96 times the standard deviation below the average of the larger preceding sentences (that is the MRS). In other words, it is defined as the smallest print size that yields 90% of the MRS \[(in logMAR)\]
Maximum Reading Speed (MRS)
时间窗: through study completion, an average of 8 months
The patient's reading speed when reading is not limited by print size , and is calculated by averaging the speed of the sentences with print size larger than the CPS. \[(in words per minute (wpm)\]
次要结局
- Intraclass Correlation Coefficients (ICCs) for study participants(through study completion, an average of 8 months)
- Test-retest Intraclass Correlation Coefficients (ICCs)(through study completion, an average of 8 months)
研究者
Georgios Labiris
Associate Professor of Ophthalmology
Democritus University of Thrace