Functional field score: the effect of using a Goldmann V-4e isopter instead of a Goldmann III-4e isopter

Maaike Langelaan, Bill Wouters, Annette C Moll, Michiel R de Boer, Ger H M B van Rens

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

PURPOSE: To investigate the underestimation of field loss in functional field score (FFS) between the Goldmann isopters III-4e and V-4e in visually impaired patients, in order to develop a predictive model for the FFS(III-4e) based on FFS(v-4e) that adjusts for possible confounders. Although the visual field is generally evaluated using Goldmann isopter III-4e, it has the disadvantage that not all low-vision patients are able to see the stimulus corresponding to this isopter.

METHODS: Goldmann visual fields were obtained from 58 patients with a variety of eye diseases. Eligibility criteria were age of 18 years or older and valid results of a Goldmann III-4e and V-4e visual field test in at least one eye. Linear regression was used to develop the model, setting FFS(III-4e) as the dependent variable and FFS(V-4e) as the independent one.

RESULTS: The FFS(V-4e) was higher than the FFS(III-4e), the mean difference being 14.56 points (95% CI, 12.48 -16.64). Multiple linear regression analysis showed that age, functional acuity score, primary eye disease, and central-peripheral loss were not confounders for the prediction of FFS(III-4e). FFS(III-4e) was estimated with the following equation: FFS(III-4e) = -19.25 + 1.063 x FFS(V-4e).

CONCLUSIONS: The relationship between FFS(III-4e) and FFS(V-4e) is linear, and the FFS(V-4e) can be used to estimate the FFS(III-4e). In practice, just subtracting 19.25 points of the value of FFS(V-4e) will be sufficient to estimate the value of FFS(III-4e). This model should give confidence about using the bigger isopter for determining the visual impairment of a person by the FFS.

Original languageEnglish
Pages (from-to)1817-23
Number of pages7
JournalInvestigative Ophthalmology and Visual Science
Volume47
Issue number5
DOIs
Publication statusPublished - May 2006

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Eye Diseases
Visual Fields
Linear Models
Low Vision
Visual Field Tests
Vision Disorders
Regression Analysis

Keywords

  • Adult
  • Female
  • Humans
  • Linear Models
  • Male
  • Quality of Life
  • Retrospective Studies
  • Vision, Low
  • Visual Field Tests
  • Visual Fields
  • Visually Impaired Persons
  • Journal Article
  • Research Support, Non-U.S. Gov't

Cite this

Langelaan, Maaike ; Wouters, Bill ; Moll, Annette C ; de Boer, Michiel R ; van Rens, Ger H M B. / Functional field score : the effect of using a Goldmann V-4e isopter instead of a Goldmann III-4e isopter. In: Investigative Ophthalmology and Visual Science. 2006 ; Vol. 47, No. 5. pp. 1817-23.
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title = "Functional field score: the effect of using a Goldmann V-4e isopter instead of a Goldmann III-4e isopter",
abstract = "PURPOSE: To investigate the underestimation of field loss in functional field score (FFS) between the Goldmann isopters III-4e and V-4e in visually impaired patients, in order to develop a predictive model for the FFS(III-4e) based on FFS(v-4e) that adjusts for possible confounders. Although the visual field is generally evaluated using Goldmann isopter III-4e, it has the disadvantage that not all low-vision patients are able to see the stimulus corresponding to this isopter.METHODS: Goldmann visual fields were obtained from 58 patients with a variety of eye diseases. Eligibility criteria were age of 18 years or older and valid results of a Goldmann III-4e and V-4e visual field test in at least one eye. Linear regression was used to develop the model, setting FFS(III-4e) as the dependent variable and FFS(V-4e) as the independent one.RESULTS: The FFS(V-4e) was higher than the FFS(III-4e), the mean difference being 14.56 points (95{\%} CI, 12.48 -16.64). Multiple linear regression analysis showed that age, functional acuity score, primary eye disease, and central-peripheral loss were not confounders for the prediction of FFS(III-4e). FFS(III-4e) was estimated with the following equation: FFS(III-4e) = -19.25 + 1.063 x FFS(V-4e).CONCLUSIONS: The relationship between FFS(III-4e) and FFS(V-4e) is linear, and the FFS(V-4e) can be used to estimate the FFS(III-4e). In practice, just subtracting 19.25 points of the value of FFS(V-4e) will be sufficient to estimate the value of FFS(III-4e). This model should give confidence about using the bigger isopter for determining the visual impairment of a person by the FFS.",
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Functional field score : the effect of using a Goldmann V-4e isopter instead of a Goldmann III-4e isopter. / Langelaan, Maaike; Wouters, Bill; Moll, Annette C; de Boer, Michiel R; van Rens, Ger H M B.

In: Investigative Ophthalmology and Visual Science, Vol. 47, No. 5, 05.2006, p. 1817-23.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Functional field score

T2 - the effect of using a Goldmann V-4e isopter instead of a Goldmann III-4e isopter

AU - Langelaan, Maaike

AU - Wouters, Bill

AU - Moll, Annette C

AU - de Boer, Michiel R

AU - van Rens, Ger H M B

PY - 2006/5

Y1 - 2006/5

N2 - PURPOSE: To investigate the underestimation of field loss in functional field score (FFS) between the Goldmann isopters III-4e and V-4e in visually impaired patients, in order to develop a predictive model for the FFS(III-4e) based on FFS(v-4e) that adjusts for possible confounders. Although the visual field is generally evaluated using Goldmann isopter III-4e, it has the disadvantage that not all low-vision patients are able to see the stimulus corresponding to this isopter.METHODS: Goldmann visual fields were obtained from 58 patients with a variety of eye diseases. Eligibility criteria were age of 18 years or older and valid results of a Goldmann III-4e and V-4e visual field test in at least one eye. Linear regression was used to develop the model, setting FFS(III-4e) as the dependent variable and FFS(V-4e) as the independent one.RESULTS: The FFS(V-4e) was higher than the FFS(III-4e), the mean difference being 14.56 points (95% CI, 12.48 -16.64). Multiple linear regression analysis showed that age, functional acuity score, primary eye disease, and central-peripheral loss were not confounders for the prediction of FFS(III-4e). FFS(III-4e) was estimated with the following equation: FFS(III-4e) = -19.25 + 1.063 x FFS(V-4e).CONCLUSIONS: The relationship between FFS(III-4e) and FFS(V-4e) is linear, and the FFS(V-4e) can be used to estimate the FFS(III-4e). In practice, just subtracting 19.25 points of the value of FFS(V-4e) will be sufficient to estimate the value of FFS(III-4e). This model should give confidence about using the bigger isopter for determining the visual impairment of a person by the FFS.

AB - PURPOSE: To investigate the underestimation of field loss in functional field score (FFS) between the Goldmann isopters III-4e and V-4e in visually impaired patients, in order to develop a predictive model for the FFS(III-4e) based on FFS(v-4e) that adjusts for possible confounders. Although the visual field is generally evaluated using Goldmann isopter III-4e, it has the disadvantage that not all low-vision patients are able to see the stimulus corresponding to this isopter.METHODS: Goldmann visual fields were obtained from 58 patients with a variety of eye diseases. Eligibility criteria were age of 18 years or older and valid results of a Goldmann III-4e and V-4e visual field test in at least one eye. Linear regression was used to develop the model, setting FFS(III-4e) as the dependent variable and FFS(V-4e) as the independent one.RESULTS: The FFS(V-4e) was higher than the FFS(III-4e), the mean difference being 14.56 points (95% CI, 12.48 -16.64). Multiple linear regression analysis showed that age, functional acuity score, primary eye disease, and central-peripheral loss were not confounders for the prediction of FFS(III-4e). FFS(III-4e) was estimated with the following equation: FFS(III-4e) = -19.25 + 1.063 x FFS(V-4e).CONCLUSIONS: The relationship between FFS(III-4e) and FFS(V-4e) is linear, and the FFS(V-4e) can be used to estimate the FFS(III-4e). In practice, just subtracting 19.25 points of the value of FFS(V-4e) will be sufficient to estimate the value of FFS(III-4e). This model should give confidence about using the bigger isopter for determining the visual impairment of a person by the FFS.

KW - Adult

KW - Female

KW - Humans

KW - Linear Models

KW - Male

KW - Quality of Life

KW - Retrospective Studies

KW - Vision, Low

KW - Visual Field Tests

KW - Visual Fields

KW - Visually Impaired Persons

KW - Journal Article

KW - Research Support, Non-U.S. Gov't

U2 - 10.1167/iovs.04-1345

DO - 10.1167/iovs.04-1345

M3 - Article

VL - 47

SP - 1817

EP - 1823

JO - Investigative ophthalmology & visual science

JF - Investigative ophthalmology & visual science

SN - 0146-0404

IS - 5

ER -