Advertisement

Visual acuity testing in diabetic subjects: the decimal progression chart versus the Freiburg visual acuity test

  • Lars Loumann KnudsenEmail author
Clinical Investigation

Abstract

Purpose

To study reproducibility and biological variation of visual acuity in diabetic maculopathy, using two different visual acuity tests, the decimal progression chart and the Freiburg visual acuity test.

Methods

Twenty-two eyes in 11 diabetic subjects were examined several times within a 12-month period using both visual acuity tests. The most commonly used visual acuity test in Denmark (the decimal progression chart) was compared to the Freiburg visual acuity test (automated testing) in a paired study.

Results

Correlation analysis revealed agreement between the two methods (r 2=0.79; slope=0.82; y-axis intercept=0.01). The mean visual acuity was found to be 15% higher (P<0.0001) with the decimal progression chart than with the Freiburg visual acuity test. The reproducibility was the same in both tests (coefficient of variation: 12% for each test); however, the variation within the 12-month examination period differed significantly. The coefficient of variation was 17% using the decimal progression chart, 35% with the Freiburg visual acuity test.

Conclusion

The reproducibility of the two visual acuity tests is comparable under optimal testing conditions in diabetic subjects with macular oedema. However, it appears that the Freiburg visual acuity test is significantly better for detection of biological variation.

Keywords

Visual Acuity Biological Variation Macular Oedema Diabetic Subject Diabetic Macular Oedema 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Bach M (1996) Freiburg Visual Acuity Test—automatic measurement of visual acuity. Optom Vision Sci 73:49–53Google Scholar
  2. 2.
    Bach M, Kommerell G (1998) Determining visual acuity using European normal values: scientific principles and possibilities for automatic measurement. Klin Monatsbl Augenheilkd 212:190–195PubMedGoogle Scholar
  3. 3.
    Duane's Clinical Ophthalmology, rev ed, vol 5 (2001) Lippincott Williams & Wilkins, Baltimore, pp 1–27Google Scholar
  4. 4.
    Wesemann W (2002) Visual acuity measured via the Freiburg visual acuity test, Bailey Lovie chart and Landolt ring chart. Klin Monatsbl Augenheilkd 219:660–667CrossRefPubMedGoogle Scholar

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Department of OphthalmologyAalborg University HospitalAalborgDenmark

Personalised recommendations