A perimetric learner's index
(1997) In Acta Ophthalmologica Scandinavica 75(6). p.665-668- Abstract
Purpose: Certain individuals need earlier perimetric experience before producing normal fields on automated static threshold perimetry. Mid-peripheral depressions and an unaffected central field are typical findings in such cases. We have devised a learner's index, to detect defect patterns that may be due to such perimetric inexperience. Methods: The central visual field was partitioned into 5 concentric zones and averages of deviations from the age-corrected normal threshold values were studied in each zone. The third test session in 74 randomly selected normal subjects provided an experienced reference material. Visual field results typical of normal individuals lacking perimetric experience were represented by the first field test... (More)
Purpose: Certain individuals need earlier perimetric experience before producing normal fields on automated static threshold perimetry. Mid-peripheral depressions and an unaffected central field are typical findings in such cases. We have devised a learner's index, to detect defect patterns that may be due to such perimetric inexperience. Methods: The central visual field was partitioned into 5 concentric zones and averages of deviations from the age-corrected normal threshold values were studied in each zone. The third test session in 74 randomly selected normal subjects provided an experienced reference material. Visual field results typical of normal individuals lacking perimetric experience were represented by the first field test obtained from each of 7 subjects ('learners') from the same group, who showed significant learning during three test sessions. A linear discriminant function, learner's index, was constructed that discriminates between typically experienced and typically inexperienced field results in normals. Results: Average deviation from age-corrected normal threshold increased with increasing eccentricity in the learner's initial fields. Clinical examples illustrate the intended use of the new index. Conclusions: The learner's index highlights those first field tests from eyes with normal visual fields, that deviate significantly from a normal experienced result in the direction of a learner's result. Patients showing significant learner's index are candidates for repeated visual field testing.
(Less)
- author
- Olsson, Jonny LU ; Åsman, Peter LU and Heijl, Anders LU
- organization
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Computer-assisted field interpretation, Discriminatory analysis, Learning, Perimetric experience, Static computerized perimetry, Visual fields
- in
- Acta Ophthalmologica Scandinavica
- volume
- 75
- issue
- 6
- pages
- 4 pages
- publisher
- Wiley
- external identifiers
-
- scopus:0031408430
- pmid:9527328
- ISSN
- 1395-3907
- DOI
- 10.1111/j.1600-0420.1997.tb00627.x
- language
- English
- LU publication?
- yes
- id
- 061efd33-8023-4689-bb37-62df8a4ca3d5 (old id 2157216)
- date added to LUP
- 2016-04-04 14:12:25
- date last changed
- 2022-01-30 01:39:29
@article{061efd33-8023-4689-bb37-62df8a4ca3d5,
abstract = {{<p>Purpose: Certain individuals need earlier perimetric experience before producing normal fields on automated static threshold perimetry. Mid-peripheral depressions and an unaffected central field are typical findings in such cases. We have devised a learner's index, to detect defect patterns that may be due to such perimetric inexperience. Methods: The central visual field was partitioned into 5 concentric zones and averages of deviations from the age-corrected normal threshold values were studied in each zone. The third test session in 74 randomly selected normal subjects provided an experienced reference material. Visual field results typical of normal individuals lacking perimetric experience were represented by the first field test obtained from each of 7 subjects ('learners') from the same group, who showed significant learning during three test sessions. A linear discriminant function, learner's index, was constructed that discriminates between typically experienced and typically inexperienced field results in normals. Results: Average deviation from age-corrected normal threshold increased with increasing eccentricity in the learner's initial fields. Clinical examples illustrate the intended use of the new index. Conclusions: The learner's index highlights those first field tests from eyes with normal visual fields, that deviate significantly from a normal experienced result in the direction of a learner's result. Patients showing significant learner's index are candidates for repeated visual field testing.</p>}},
author = {{Olsson, Jonny and Åsman, Peter and Heijl, Anders}},
issn = {{1395-3907}},
keywords = {{Computer-assisted field interpretation; Discriminatory analysis; Learning; Perimetric experience; Static computerized perimetry; Visual fields}},
language = {{eng}},
number = {{6}},
pages = {{665--668}},
publisher = {{Wiley}},
series = {{Acta Ophthalmologica Scandinavica}},
title = {{A perimetric learner's index}},
url = {{http://dx.doi.org/10.1111/j.1600-0420.1997.tb00627.x}},
doi = {{10.1111/j.1600-0420.1997.tb00627.x}},
volume = {{75}},
year = {{1997}},
}