Feasibility of the Radner Reading Charts in low-vision patients
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Being unable to read is a major problem for visually impaired patients. Since distance visual acuity (VA) does not adequately reflect reading ability, it is important to also evaluate near VA. The Radner Reading Charts (RRCs) are available to measure patients’ reading performance. The present study tested the inter-chart and test-retest reliability of the RRCs in Dutch low-vision patients (i.e., visual acuity ≥0.3 logMAR) with various eye disorders.
Thirty-eight patients read the three RRCs in random order. Then, about 1 month after the initial measurements, a test-retest procedure was performed in 15 of the 38 patients. Tested variables were reading acuity (logRAD), logRAD score, logRAD/logMAR ratio, maximum reading speed (MRS), and critical print size (CPS). Both MRS and CPS were calculated in two different ways. To determine the variability, a mixed-model analysis was used.
For all variables, the largest part of the variance was explained by the individual subject (86–89%) whereas the chart accounted for only 0–0.78% of the variability. Therefore, the inter-chart and test-retest reliability was high, except for the CPS which had a poor to moderate reliability (31–62%) when calculated in the two different ways.
The inter-chart and test-retest results showed high reliability in patients with low vision due to various diseases; therefore, the charts are feasible to determine effects in large groups.
KeywordsRadner Reading Charts Reliability Low vision Reading acuity
The authors thank Michiel Panhuysen, Gabriëlle Janssen, and Tamara Brusee for their help in recruiting patients, measuring distance VA, and providing optimal refractive corrections.
This study was supported by a grant from ZonMw InZicht (the Netherlands Organization for Health Research and Development-InSight Society) and the Catholic Foundation for the Blind and Visually Impaired. The authors have no financial interest in the Radner Reading Charts and did not receive any royalties for its sale.
- 6.Sloan LL, Brown DJ (1963) Reading cards for selection of optical aids for the partially sighted. Am J Ophthalmol 55:1187Google Scholar
- 8.Mansfield J, Ahn S, Legge G, Leubker A (1993) A new reading-acuity charts for normal and low vision. Opt Soc Am Tech Digest 3:232–235Google Scholar
- 13.Radner W (2008) Introducing a new reading chart. Ophthalmol Times Eur 4:174–181Google Scholar
- 14.Kooijman AC, Beerthuizen JJG (1996) [Juego de optotipos, unidad-M, para la lectura]. In: Vision '96: Proceedings of the International Low Vision Conference 1996. Book I. ONCE, Madrid, pp 39–44Google Scholar
- 21.John PWM (1971) Statistical design and analysis of experiments. The Macmillan Company, New YorkGoogle Scholar
- 23.Subramanian A, Pardhan S (2009) How repeatable are indices of reading ability in subjects with impaired vision? Invest Ophthalmol Vis Sci 83:572–576Google Scholar
- 27.Burggraaff MC, Van Nispen RMA, Melis-Dankers BJM, Van Rens GHMB (2010) Effects of a standard training in the use of closed-circuit televisions in visually impaired adults: design of a training protocol and a randomized controlled trail. BMC Health Serv Res. doi: 77872658834458815 PubMedGoogle Scholar
- 31.National Research Committee on Vision (1980) Recommended standard procedures for the clinical measurement and specification of visual acuity. Adv Ophthalmol 41:103–148Google Scholar
- 33.Nunnally JC (1967) Psychometric theory. McGraw Hill, New YorkGoogle Scholar
- 34.Raasch TW, Flom RE (1994) Precision of visual acuity measurement in low vision. Invest Ophthalmol Vis Sci 35:1413Google Scholar