Vistech VCTS 6500 Charts???Within- and Between-Session Reliability

Reeves, Barnaby C; Hill, Adrian R.

doi:10.1097/00006324-199109000-00010

Cited by 85 publications

(43 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The level of TRV for ETDRS acuities in this study (70.18 logMAR) is consistent with a number of published research papers. [5][6][7][8] However, some workers including Elliott and Sheridan 14 and Arditi and Cagenello 15 have achieved levels of TRV using the ETDRS chart, which are similar to those achieved using the PC5-test in this study.…”

Section: Discussionsupporting

confidence: 82%

“…The published data suggest that changes in acuity of around two lines of letters may be required to achieve significance at the 5% level. [5][6][7][8] Increased TRV also has implications for the design of any clinical trial which uses acuity as a primary outcome measure. 9 For such a trial, any increase in the TRV of acuity will necessitate an increased sample size to demonstrate a given clinical change with a given degree of statistical power.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving on ETDRS acuities: design and results for a computerised thresholding device

Rosser

Murdoch

Fitzke

et al. 2003

Eye

View full text Add to dashboard Cite

Aims All visual acuity data are subject to test-retest variability (TRV). This measurement error obscures true clinical change and reduces the statistical power of clinical trials using acuity as a primary outcome measure. This study was designed to assess whether a computerised system can reduce TRV by taking repeated acuity measurements and averaging them. A computerised system (PC-test) was developed for this purpose and compared in terms of TRV with the current Gold Standard ETDRS logMAR chart. Methods A total of 19 subjects with a mean acuity of þ 0.16 logMAR (range þ 0.49 to À0.10 logMAR) were recruited. The performance of two computerised tests (one averaging 10 repeats and one five) was compared with that of the ETDRS logMAR chart in terms of TRV and agreement of acuity data. Results The 10 and five repeat computerised tests (PC-tests) produced a TRV of 70.11 and 70.10 logMAR, respectively, compared with 70.18 logMAR for the ETDRS chart. No significant bias was observed between PC-test and ETDRS acuities. Conclusions A computerised system that takes repeated acuity measurements and averages them is subject to less TRV than a single ETDRS acuity measurement. A reduced TRV of visual acuity data allows earlier detection of true clinical change in individual patients. It also allows smaller differences between groups to be detected in clinical trials for a given degree of statistical confidence and power.

show abstract

Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Improving on ETDRS acuities: design and results for a computerised thresholding device

Rosser

Murdoch

Fitzke

et al. 2003

Eye

View full text Add to dashboard Cite

show abstract

“…For ETDRS logMAR acuity charts, changes of up to 10 logMAR letters (2 logMAR lines) in either direction are recognised to occur. [5][6][7][8][9][10][11][12][13][14][15] This aspect of the performance of Kay picture acuity measurements has also not previously been investigated.…”

Section: Introductionmentioning

confidence: 99%

Validation of printed and computerised crowded Kay picture logMAR tests against gold standard ETDRS acuity test chart measurements in adult and amblyopic paediatric subjects

Shah

Laidlaw

Rashid

et al. 2011

Eye

View full text Add to dashboard Cite

show abstract

“…The level of TRV achieved with the RLME chart (95% confidence limits of 70.15 logMAR) is consistent with previous studies, which measured the TRV of five-letter-per-row logMAR charts which range from 70.09 to 70.20. [10][11][12][13][14][15] The number of optotypes per line on the E chart was limited to three to improve the ease of administration. Although this study did not assess test time, a previous study 8 found that a letter chart featuring an identical design to the RLME chart allowed measurements to be taken in half the time of the fiveletter-per-row ETDRS chart.…”

Section: Discussionmentioning

confidence: 99%

Evaluating a new logMAR chart designed to improve visual acuity assessment in population-based surveys

Bourne

Rosser

Sukudom

et al. 2003

Eye

View full text Add to dashboard Cite

Aims This study aimed to evaluate a new chart designed to improve the collection of visual acuity data in population-based surveys. The Reduced logMAR E chart (RLME) employs three letters per line, 'tumbling E' optotypes, and conforms to accepted contemporary design principles. Methods The performance of the chart was assessed within a population-based glaucoma survey in Thailand. Performance indices were test-retest variability (TRV) and agreement with acuity data measured using the ETDRS logMAR chart which acted as the 'gold standard'. Results The 95% confidence limits for TRV of RLME acuity data were 70.15 logMAR. This figure is consistent with published data on the TRV of acuities measured using five-letter-perline logMAR charts. The mean difference between RLME and ETDRS acuity data was 0.00 logMAR (95% confidence intervals of 70.05 logMAR) indicating that RLME acuities agreed well with those of the ETDRS chart. The chart and its method of use was readily accepted by the local ancillary staff who required only minimal training before acuity measurement could be delegated to them. Conclusions The study demonstrated that the RLME chart is capable of accurate and repeatable acuity measurements. Certain aspects of the design of the RLME chart may be particularly pertinent to the measurement of vision in population-based surveys.

show abstract

Vistech VCTS 6500 Charts???Within- and Between-Session Reliability

Cited by 85 publications

References 0 publications

Improving on ETDRS acuities: design and results for a computerised thresholding device

Improving on ETDRS acuities: design and results for a computerised thresholding device

Validation of printed and computerised crowded Kay picture logMAR tests against gold standard ETDRS acuity test chart measurements in adult and amblyopic paediatric subjects

Evaluating a new logMAR chart designed to improve visual acuity assessment in population-based surveys

Contact Info

Product

Resources

About