| Project/Area Number |
59870056
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Ophthalmology
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
TOKORO Takashi Professor, School of Med., Tokyo Medical and Dental University, 医学部, 教授 (20013865)
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| Co-Investigator(Kenkyū-buntansha) |
MURAMATSU Tomoyuki Assistant, School of Med., Tokyo Medical and Dental University, 医学部, 助手 (80134691)
FUJIEDA Masanao Engineer, Technical Dept., NIDEK Co., Ltd., 技術部, 技師
OKUYAMA Fumio Assistant, School of Med., Tokyo Medical and Dental University, 医学部, 助手 (70134690)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥10,100,000 (Direct Cost: ¥10,100,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1985: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1984: ¥6,800,000 (Direct Cost: ¥6,800,000)
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| Keywords | Accommodation / Vergence / Pupil size / オプトメーター |
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| Research Abstract |
Accommodation, vergence and pupil movement of the human eye are related to each other, and this phenomenon is called a triad system which plays an important role to input accurate visual informations.
The purpose of this project is to develope a practical system, in which accommodation, vergence and pupil size are measured simultaneouly and dynamically.
In order to measure the above three movements simultaneouly and dynamically, we had study the mechanism to measure accommodation of the eye during convergence or divergence.
To solve this problem, we had to make coincide the optical axis of an optometer with the visual axis of the human eye. Therefore we designed an instrument which detects the eye movement with the electro-optical method and conpensates the difference between the optical axis and the visual axis by a closed-loop electro-optical servo-system. By this instrument we could practically measure accommodation during vergence. We call this instrument a vergence tracking instrument.
And then we developed the system, which was consisted of optometer, vergence tracking instrument and electric pupilometer. The main perfomances of this system were;
1.The accuracy of accommodation measurement was 0.4 diopters within a range of 50 degree of eye movement. 2.The response of vergence tracking had a maximum rotary rate of 100 degree/sec.
Using this system,we has simultaneouly measured the three responses of the human eye binocularly in condition of the real target stimuli. Therefore we concluded that this system could be a useful apparatus for examination of visual function in ophthalomology in future.
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