Simultaneous Measurement of Objective and Subjective Accommodation in Response to Step Stimulation
- Resource Type
- Authors
- Takeshi Morimoto; Tomomitsu Miyoshi; Masakazu Hirota; Takashi Fujikado
- Source
- Investigative Ophthalmology & Visual Science
- Subject
- Adult
Male
accommodation
medicine.medical_specialty
genetic structures
Visual Acuity
Refraction, Ocular
03 medical and health sciences
0302 clinical medicine
Visual Psychophysics and Physiological Optics
pupils
Ophthalmology
Reaction Time
medicine
Humans
Dioptre
Mathematics
Monocular
business.industry
Accommodation, Ocular
Pupil
Mean age
Presbyopia
Middle Aged
Healthy Volunteers
Amplitude of accommodation
Visual recognition
Amplitude
medicine.anatomical_structure
030221 ophthalmology & optometry
Female
Human eye
business
Accommodation
030217 neurology & neurosurgery
- Language
- ISSN
- 1552-5783
Purpose This study aimed to evaluate differences in objective and subjective accommodation dynamically and simultaneously. Methods Thirty-four pre-presbyopic healthy volunteers (mean age ± SD, 41.0 ± 3.2 years) participated in this study. Initially, the reaction time for detecting a change in the target was measured at near. Dynamic accommodation was then monocularly recorded using an open-view Shack–Hartmann aberrometer and compared with the amplitude and velocity of subjective accommodation. Results The objective amplitude of accommodation (0.97 ± 0.32 diopter [D]) was significantly greater than the subjective amplitude of accommodation (0.62 ± 0.43 D; P < 0.001). The accommodative velocity was significantly faster for the “before the accommodation” response time (0.47 ± 0.38 D/s) than the “after the accommodation” response time (0.21 ± 0.22 D/s; P = 0.007). Conclusions The human eye under the monocular condition quickly adjusts to the focal plane to clearly archive the nearby object, and the focal plane thereafter is slowly and accurately adjusted to the visual target after visual recognition.