Low Vision, Near Vision, Presbyopia
Conditions
Keywords
digital near vision chart, critical print size, reading acuity, reading speed, digital Greek MNREAD
Brief summary
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.
Detailed description
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: 1. Reading Acuity (RA) 2. Maximum Reading Speed (MRS) 3. Critical Print Size (CPS) 4. 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.
Interventions
DIAGNOSTIC_TESTMNREAD testing
One randomly selected eye is included for each study participant. Participants respond to the near vision chart with defined environmental circumstances at 40cm viewing distance. All four parameters (RA, MRS, CPS and ACC) are evaluated.
Sponsors
Democritus University of Thrace
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
* adequate literacy of written Greek language
Exclusion criteria
* dyslexia * attention-deficiency * former diagnosis of mental diseases * former diagnosis of psychiatric diseases
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Reading Acuity (RA) | 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). |
| Maximum Reading Speed (MRS) | 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. \[(in words per minute (wpm)\] |
| Critical Print Size (CPS) | 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 \[(in logMAR)\] |
| Accessibility Index (ACC) | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Intraclass Correlation Coefficients (ICCs) for study participants | through study completion, an average of 8 months | Level of agreement between the print and the digital version are evaluated by calculation of the ICCs for the 4 reading parameters (RA, MRS, CPS, ACC). |
| Test-retest Intraclass Correlation Coefficients (ICCs) | through study completion, an average of 8 months | Test-retest reliability of the digital optotype is evaluated by ICCs for the 4 reading parameters (RA, MRS, CPS, ACC).. |
Countries
Greece
Outcome results
None listed