Br J Ophthalmol 2000;84:244-250
( March )
Macular degeneration: do conventional measurements of impaired
visual function equate with visual disability?
M E McClurea, P M Harta, A J Jacksona, M R Stevensonb, U Chakravarthya
a Division of
Ophthalmology and Vision Science, The Queen's University of Belfast
and Royal Group of Hospitals, Belfast BT12 6BA, b Health and Social Care Research Unit, The
Queen's University of Belfast, Belfast BT12 6BA
Correspondence to: M E McClure, Low Vision and Contact Lens Clinic, Department
of Ophthalmology, Royal Group of Hospitals, Grosvenor Road, Belfast
BT12 6BA
Accepted for publication 1 October 1999
AIMS To examine the
relation between measures of vision and ability to perform daily living
tasks in those visually impaired with macular degeneration.
METHODSA visual
functioning index (daily living tasks dependent on vision: DLTV) was
used to evaluate patients' perception of their ability to perform
vision dependent tasks. Distance visual acuity, near visual acuity,
reading speed, and contrast sensitivity were measured in all patients.
In addition, a new measure of reading ability
was derived, designated the reading index. This
takes into account both the size of the text read and the time to read it and is equivalent to the reading speed in words per minute divided
by text size in M.
RESULTSThe reading
index was found to show best associations with the majority of items
within the DLTV. Stepwise regression identified the combination of
reading index and distance visual acuity as having the best
associations with DLTV items. The present study also demonstrated that
specific levels of vision as measured by acuity, reading index, and
contrast sensitivity corresponded with different perceived amounts of
difficulty in the performance of daily living tasks.
CONCLUSIONSThis study
showed that reading index is valuable in predicting the ability to
perform daily living tasks and therefore may be useful in the visual
assessment of the visually impaired individual. In addition, this study
identified specific levels of vision at which individuals reported
different degrees of difficulty in performing daily living tasks.
© 2000 by British Journal of Ophthalmology
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