Night-vision aid using see-through display for patients with retinitis pigmentosa
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From an early stage, retinitis pigmentosa (RP) patients suffer from night blindness which causes nocturnal mobility difficulties. We created a wearable visual aid that uses a high-performance see-through display, and added a high-sensitivity camera with a complementary metal-oxide-semiconductor sensor. Here, we evaluate the device’s efficacy for helping night-blindness sufferers walk in the dark.
Prospective clinical study.
Twenty-eight subjects underwent binocular visual acuity testing in the dark without (power off) and with (power on) the device. The test was carried out in a darkened room. We recorded the number of trial errors and the time it took each subject to arrive at the goal both with and without the aid of our device.
Our device effectively assists walking in RP patients with mobility problems in the dark.
Binocular visual acuity in the dark was significantly improved with the aid of our device. In the walking test, the number of errors decreased greatly with the device, and the travel time was significantly shortened.
Keywordssee-through display visual aids night blindness retinitis pigmentosa
We gratefully thank Mr. Masatoshi Tate and Toshiki Tsujinaka for their critical feedback on this study. We also gratefully thank Miss Hiroko Seto, Mrs. Mutsumi Yao, Miss Miyuki Yamao and Miss Yuina Hayashida for their assistance in the walking test. This study was funded by HOYA Co., Ltd..
Conflicts of interest
Y. Ikeda, Grant (Alcon, Bayer, HOYA, Santen), Lecture fees (Alcon, Bayer, HOYA, Nidek, Santen); S. Nakatake, None; J. Funatsu, None; K. Fujiwara, None; T. Tachibana, None; Y. Murakami, Grant (Rohto, Santen); T. Hisatomi, Grant (Alcon, Bayer, Santen); S. Yoshida, Grant (Bonac), Lecture fees (Alcon, Bayer); H. Enaida, Grant (Alcon), Donation (HOYA, Santen), Equipment (Nidek), Lecture fees (Alcon, Santen); T. Ishibashi, Lecture fees (Alcon, Bausch + Lomb, Bayer, Chuo Sangio, HOYA, Kowa, Novartis, Santen); K. Sonoda, Grant (Alcon, HOYA, Santen), Lecture fees (AbbVie, Alcon, Santen, Wakamoto).
Supplementary material 2 The walking test with the device (power off). The subject (No. 3) walked toward the goal with the device (power off). He stumbled over the first black carpet. He could not walk without orientation. (MP4 56709 kb)
Supplementary material 3 The walking test with the device (power on). The same subject (No. 3) walked with the device (power on). He could recognize all gates and successfully walk toward the goal. (MP4 32832 kb)
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