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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
4
|
| pubmed:dateCreated |
1995-8-15
|
| pubmed:abstractText |
When measuring horizontal relative vergence ranges, the conventional clinical procedure is to assess the base-in (or divergence) range before the base-out (or convergence) determination. The rationale for this order of testing is that the convergence responses stimulated during the base-out measurements may produce vergence adaptation (i.e., a fusional aftereffect), which may temporarily bias the subsequent base-in values in the base-out direction. However, the effect of reversing this order of testing (i.e, base-out before base-in) has not been directly evaluated. Accordingly, the present study compared distance base-in vergence ranges measured both before and after base-out testing at separate test sessions. Additionally, tonic vergence (TV) was assessed before and after each vergence range measurement. The results indicated that base-out vergence range testing stimulated vergence adaptation, and furthermore produced a statistically significant reduction in the subsequently measured base-in recovery value. However, the magnitude of this shift was less than the estimated degree of repeatability of the vergence range measurement. Therefore, a more appropriate order of testing would be to assess the heterophoria compensating range first in order to obtain accurate results during this more critical measurement.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Apr
|
| pubmed:issn |
1040-5488
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
72
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
219-23
|
| pubmed:dateRevised |
2004-11-17
|
| pubmed:meshHeading |
pubmed-meshheading:7609946-Adaptation, Ocular,
pubmed-meshheading:7609946-Adult,
pubmed-meshheading:7609946-Convergence, Ocular,
pubmed-meshheading:7609946-Distance Perception,
pubmed-meshheading:7609946-Humans,
pubmed-meshheading:7609946-Middle Aged,
pubmed-meshheading:7609946-Vision Tests,
pubmed-meshheading:7609946-Visual Acuity
|
| pubmed:year |
1995
|
| pubmed:articleTitle |
Vergence adaptation and the order of clinical vergence range testing.
|
| pubmed:affiliation |
Department of Vision Sciences, State College of Optometry, State University of New York, New York, USA.
|
| pubmed:publicationType |
Journal Article
|