Testing vision testing: quantifying the effect of movement on visual acuity measurement
| Autor: | Laurence P. Tidbury, Anna R. O'Connor |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Adult
Male Visual acuity Adolescent Movement Video Recording Visual Acuity Chart Medicine Humans Vision test Orthoptics Aged business.industry Movement (music) Distance Perception Vision Tests Testing vision Middle Aged Chin Test (assessment) Ophthalmology medicine.anatomical_structure Clinical Study Optometry Female medicine.symptom business |
| Popis: | Assessment of visual acuity (VA) has been shown to vary between tests, which may be attributable in part to test inaccuracies, such as a change in the distance between the chart and subject. Therefore, the study aim was to quantify changes in chart/patient separation during near and distance VA testing, and to analyse the relationship between VA and movement observed. Volunteer orthoptists and subjects were filmed during near and distance VA testing, with the amount of movement determined from the recording. Controlling for movement using chin rests and chart stands, VA was retested. Actual changes in VA due to a change in subject or chart movement were compared with theoretical predictions. Fifty-one subjects (18–73 years) were assessed. Median (interquartile) movements of 0.06 m (0.07) towards and 0.11 m (0.08) away from the chart were measured (maximum 0.17 m towards and 0.24 m away). Significant differences in VA score were measured when movement was restricted, at near and distance (P |
| Databáze: | OpenAIRE |
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