Temporal summation in children with a history of retinopathy of prematurity.
Invest Ophthalmol Vis Sci
; 56(2): 914-7, 2015 Jan 20.
Article
em En
| MEDLINE
| ID: mdl-25604681
ABSTRACT
PURPOSE:
To assess temporal summation in children with a history of retinopathy of prematurity (ROP) by determining the critical duration (tCRIT) for complete temporal summation under rod-mediated conditions. From prior ERG studies, it is known that the kinetics of activation of phototransduction are prolonged in the ROP rod photoreceptor.METHODS:
Dark-adapted thresholds for detecting 10° diameter stimuli with durations from 10 to 640 ms were measured. A two-alternative, spatial, forced-choice psychophysical procedure was used. The tCRIT for complete summation was estimated in former preterm subjects with a history of severe ROP (n = 7), mild ROP (n = 23), and no ROP (n = 15). The subjects ranged in age from 10.4 to 17.6 (median 15.6) years. Age-similar term-born control subjects (n = 5) were also tested.RESULTS:
Critical duration was significantly longer in subjects with a history of ROP than in subjects who never had ROP or who were born at term. Mean tCRIT in the mild ROP group [127.5 (SD = 19.9) ms] and severe group [147.6 (SD = 18.9) ms] did not differ significantly, but both were significantly longer than in former preterms who never had ROP [101.1 (SD = 16.5) ms] and in term-born controls [101.0 (SD = 19.5) ms].CONCLUSIONS:
In ROP subjects, tCRIT is significantly prolonged. This is likely due to abnormal kinetics in the rod outer segment.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Limiar Sensorial
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Retinopatia da Prematuridade
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Células Fotorreceptoras Retinianas Bastonetes
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Adaptação à Escuridão
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
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Child
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Child, preschool
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Female
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Humans
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Infant
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Male
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Newborn
Idioma:
En
Revista:
Invest Ophthalmol Vis Sci
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos