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Guideline development for the evaluation of visual impairment in Korea.

Chin HS, Park SH, Park IK, Kwon JW, Lee SJ, Steering Committee of Korean Guides for Impairment Rating in Korean Academy of Medical Scienc - J. Korean Med. Sci. (2009)

Bottom Line: A further adjustment of the impairment rating is included at the final step of this evaluation.The adjustment can be added to impairment rating up to 15%.Further study is necessary to revise and update of this disability evaluation that have potential problems in actual application.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Inha University School of Medicine, Incheon, Korea. hschin@inha.ac.kr

ABSTRACT
This guideline is developed to provide criteria for evaluating permanent impairment of the visual system as it affects an individual's ability to perform activities of daily living. This new assessment system is based on the 5th and 6th edition of American Medical Association and McBride impairment assessment system but revised on the consideration of Korean culture and simple application. This evaluation of impairment is based on an assessment of visual acuity and visual field. Especially it weighs binocular vision and binocular visual fields and the binocular vision and binocular visual fields provide 50% of weight and the right and left eye each contribute 25%. A further adjustment of the impairment rating is included at the final step of this evaluation. Functional deficits for individual adjustments include diplopia, problem of accommodation, abnormality of eyelids, tearing, cosmetic problems from cornea opacity, glare, aphakia, and dark-adaptation. The adjustment can be added to impairment rating up to 15%. Further study is necessary to revise and update of this disability evaluation that have potential problems in actual application.

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Related in: MedlinePlus

Distribution of the Grid Points for Visual Field Evaluation. The first circle from center represent a 10° radius and the second one indicates 20° radius. Total visual field score is 40 points within the inner 10° and 60 points within the 20° range. Also 40 points are assigned to the upper half of field and 60 points are assigned to the lower half. The average normal field will score about 100 points.
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Figure 1: Distribution of the Grid Points for Visual Field Evaluation. The first circle from center represent a 10° radius and the second one indicates 20° radius. Total visual field score is 40 points within the inner 10° and 60 points within the 20° range. Also 40 points are assigned to the upper half of field and 60 points are assigned to the lower half. The average normal field will score about 100 points.

Mentions: The Goldmann visual field equipment is the preferred standard although automated perimetry (commonly used equipment includes Humphrey, Octopus etc.) is possible. Most clinical automated static perimetry tests are limited to the central 30° radius. For the functional assessment of visual field loss, however, testing to a 60 radius or beyond is mandatory. When kinetic perimetry is used, the III4e isopter should be plotted. When automated, static perimetry is used, the results are displayed as a gray scale, not as isopters. Therefore, a pseudoisopter equivalent to the Goldmann III4e isopter must be constructed. On the Humphrey equipment, this would be the isopter for a 10-dB stimulus and 7-dB stimulus on the Octopus equipment. Considering of both monocular and binocular function is important. Direct testing of the binocular visual field presents problems, however, because the amount of convergence in a bowl perimeter can not be monitored and fixation monitoring devices will not work when the head is centered. Therefore, the fields of each eye should be measured separately, and a binocular field plot should be derived from the superimposition of the two monocular field plots.


Guideline development for the evaluation of visual impairment in Korea.

Chin HS, Park SH, Park IK, Kwon JW, Lee SJ, Steering Committee of Korean Guides for Impairment Rating in Korean Academy of Medical Scienc - J. Korean Med. Sci. (2009)

Distribution of the Grid Points for Visual Field Evaluation. The first circle from center represent a 10° radius and the second one indicates 20° radius. Total visual field score is 40 points within the inner 10° and 60 points within the 20° range. Also 40 points are assigned to the upper half of field and 60 points are assigned to the lower half. The average normal field will score about 100 points.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2690062&req=5

Figure 1: Distribution of the Grid Points for Visual Field Evaluation. The first circle from center represent a 10° radius and the second one indicates 20° radius. Total visual field score is 40 points within the inner 10° and 60 points within the 20° range. Also 40 points are assigned to the upper half of field and 60 points are assigned to the lower half. The average normal field will score about 100 points.
Mentions: The Goldmann visual field equipment is the preferred standard although automated perimetry (commonly used equipment includes Humphrey, Octopus etc.) is possible. Most clinical automated static perimetry tests are limited to the central 30° radius. For the functional assessment of visual field loss, however, testing to a 60 radius or beyond is mandatory. When kinetic perimetry is used, the III4e isopter should be plotted. When automated, static perimetry is used, the results are displayed as a gray scale, not as isopters. Therefore, a pseudoisopter equivalent to the Goldmann III4e isopter must be constructed. On the Humphrey equipment, this would be the isopter for a 10-dB stimulus and 7-dB stimulus on the Octopus equipment. Considering of both monocular and binocular function is important. Direct testing of the binocular visual field presents problems, however, because the amount of convergence in a bowl perimeter can not be monitored and fixation monitoring devices will not work when the head is centered. Therefore, the fields of each eye should be measured separately, and a binocular field plot should be derived from the superimposition of the two monocular field plots.

Bottom Line: A further adjustment of the impairment rating is included at the final step of this evaluation.The adjustment can be added to impairment rating up to 15%.Further study is necessary to revise and update of this disability evaluation that have potential problems in actual application.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Inha University School of Medicine, Incheon, Korea. hschin@inha.ac.kr

ABSTRACT
This guideline is developed to provide criteria for evaluating permanent impairment of the visual system as it affects an individual's ability to perform activities of daily living. This new assessment system is based on the 5th and 6th edition of American Medical Association and McBride impairment assessment system but revised on the consideration of Korean culture and simple application. This evaluation of impairment is based on an assessment of visual acuity and visual field. Especially it weighs binocular vision and binocular visual fields and the binocular vision and binocular visual fields provide 50% of weight and the right and left eye each contribute 25%. A further adjustment of the impairment rating is included at the final step of this evaluation. Functional deficits for individual adjustments include diplopia, problem of accommodation, abnormality of eyelids, tearing, cosmetic problems from cornea opacity, glare, aphakia, and dark-adaptation. The adjustment can be added to impairment rating up to 15%. Further study is necessary to revise and update of this disability evaluation that have potential problems in actual application.

Show MeSH
Related in: MedlinePlus