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Using the KM visual acuity chart for more reliable evaluation of amblyopia compared to the HVOT method

Moutakis, Konstantin LU ; Stigmar, G and Hall-Lindberg, J (2004) In Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00 82(5). p.547-551
Abstract
Purpose: To evaluate a new letter matching visual acuity (VA) chart (the KM chart) for children aged 5-7 years, designed as a Monoyer-based chart, in order to obtain a better consistency between school and preschool VA recordings. Methods: Visual acuities were assessed using three methods: the HVOT, KM and Monoyer charts. Comparisons were made between the KM method versus the HVOT and Monoyer methods, respectively. Children with normal vision and with different degrees of amblyopia were investigated. Results: Visual acuity levels appeared significantly higher in children with amblyopia when tested with the HVOT chart than when tested with the KM chart. Visual acuities obtained with the Monoyer and KM methods were comparable. The difference... (More)
Purpose: To evaluate a new letter matching visual acuity (VA) chart (the KM chart) for children aged 5-7 years, designed as a Monoyer-based chart, in order to obtain a better consistency between school and preschool VA recordings. Methods: Visual acuities were assessed using three methods: the HVOT, KM and Monoyer charts. Comparisons were made between the KM method versus the HVOT and Monoyer methods, respectively. Children with normal vision and with different degrees of amblyopia were investigated. Results: Visual acuity levels appeared significantly higher in children with amblyopia when tested with the HVOT chart than when tested with the KM chart. Visual acuities obtained with the Monoyer and KM methods were comparable. The difference between the Monoyer and KM methods on the one hand, and the HVOT method on the other, can be explained by the fact that the HVOT chart elicits less crowding effect than the other two charts. Conclusions: Visual acuity in children with amblyopia might be overestimated if the HVOT test alone is used to assess vision. Use of the HVOT chart, therefore, should be restricted to the 3.5-4.5 years age group, for whom the KM chart is somewhat too difficult. In our opinion the KM chart should be preferred for use with older preschool children because it shows good consistency with the Monoyer chart. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
vision testing, preschool, Monoyer chart, KM chart, HVOT chart, amblyopia, crowding, visual acuity
in
Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00
volume
82
issue
5
pages
547 - 551
publisher
Wiley-Blackwell
external identifiers
  • pmid:15453851
  • wos:000224169700009
  • scopus:6344294038
ISSN
1395-3907
DOI
10.1111/j.1600-0420.2004.00307.x
language
English
LU publication?
yes
id
1ce607dc-bce6-4c7f-8560-5779b43e2c01 (old id 267226)
date added to LUP
2007-10-28 15:51:53
date last changed
2017-10-01 04:36:39
@article{1ce607dc-bce6-4c7f-8560-5779b43e2c01,
  abstract     = {Purpose: To evaluate a new letter matching visual acuity (VA) chart (the KM chart) for children aged 5-7 years, designed as a Monoyer-based chart, in order to obtain a better consistency between school and preschool VA recordings. Methods: Visual acuities were assessed using three methods: the HVOT, KM and Monoyer charts. Comparisons were made between the KM method versus the HVOT and Monoyer methods, respectively. Children with normal vision and with different degrees of amblyopia were investigated. Results: Visual acuity levels appeared significantly higher in children with amblyopia when tested with the HVOT chart than when tested with the KM chart. Visual acuities obtained with the Monoyer and KM methods were comparable. The difference between the Monoyer and KM methods on the one hand, and the HVOT method on the other, can be explained by the fact that the HVOT chart elicits less crowding effect than the other two charts. Conclusions: Visual acuity in children with amblyopia might be overestimated if the HVOT test alone is used to assess vision. Use of the HVOT chart, therefore, should be restricted to the 3.5-4.5 years age group, for whom the KM chart is somewhat too difficult. In our opinion the KM chart should be preferred for use with older preschool children because it shows good consistency with the Monoyer chart.},
  author       = {Moutakis, Konstantin and Stigmar, G and Hall-Lindberg, J},
  issn         = {1395-3907},
  keyword      = {vision testing,preschool,Monoyer chart,KM chart,HVOT chart,amblyopia,crowding,visual acuity},
  language     = {eng},
  number       = {5},
  pages        = {547--551},
  publisher    = {Wiley-Blackwell},
  series       = {Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00},
  title        = {Using the KM visual acuity chart for more reliable evaluation of amblyopia compared to the HVOT method},
  url          = {http://dx.doi.org/10.1111/j.1600-0420.2004.00307.x},
  volume       = {82},
  year         = {2004},
}