Objective Verification of Physiologic Changes during Accommodation under Binocular, Monocular, and Pinhole Conditions
Journal of Korean Medical Science
;
: e32-2019.
Artigo
em Inglês
| WPRIM
| ID: wpr-719548
ABSTRACT
BACKGROUND:
To objectively investigate accommodative response to various refractive stimuli in subjects with normal accommodation.METHODS:
This prospective, non-randomized clinical trial included 64 eyes of 32 subjects with a mean spherical equivalent −1.4 diopters (D). We evaluated changes in accommodative power, pupil diameter, astigmatic value, and axis when visual stimuli were applied to binocular, monocular (dominant eye, non-dominant eye, ipsilateral, and contralateral), and pinhole conditions. Visual stimuli were given at 0.25 D (4 m), 2 D (50 cm), 3 D (33 cm), and 4 D (25 cm) and accommodative response was evaluated using open view binocular autorefractor/keratometer.RESULTS:
The accommodative response to binocular stimulus was 90.9% of the actual refractive stimulus, while that of the monocular stimulus was 84.6%. The binocular stimulus induced a smaller pupil diameter than did the monocular stimulus. There was no difference in accommodative response between the dominant eye and non-dominant eye or between ipsilateral and contralateral stimuli. As the refractive stimuli became stronger, the absolute astigmatic value increased and the direction of the astigmatism axis became more horizontal. Pinhole glasses required 10%–15% less accommodative power compared with the monocular condition.CONCLUSION:
Binocular stimuli enable more precise and effective accommodation than do monocular stimuli. Accommodative response is composed of 90% true accommodation and 10% pseudo-accommodation, and the refractive stimulus in one eye affects the contralateral eye to the same extent. This should be taken into account when developing guidelines for wearing smart glasses while driving, as visual stimulation is applied to only one eye, but far distance attention is constantly needed. TRIAL REGISTRATION ClinicalTrials.gov Identifier NCT03557346
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Estimulação Luminosa
/
Astigmatismo
/
Pupila
/
Estudos Prospectivos
/
Óculos
/
Telescópios
/
Ensaios Clínicos Controlados não Aleatórios como Assunto
/
Vidro
Tipo de estudo:
Ensaio Clínico Controlado
/
Guia de Prática Clínica
/
Estudo observacional
Idioma:
Inglês
Revista:
Journal of Korean Medical Science
Ano de publicação:
2019
Tipo de documento:
Artigo
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