Clinical & experimental optometry · 2017
Influence of mouth and jaw movements on dynamics of spontaneous eye blink activity assessed during slitlamp biomicroscopy.
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Doughty Michael J
Аннотация
BACKGROUND: To evaluate oculo-mandibular interactions during evaluation of spontaneous eye blink rate (SEBR) of normal young adult human subjects while seated at a slitlamp.
METHODS: Repeat video recordings of five minutes duration were made on 76 young adult emmetropic subjects aged 18-25 years. The subjects were instructed to direct their gaze horizontally toward a distant target with the entire cornea of the left eye illuminated with a broad beam cobalt blue light. Repeat recordings were made: (a) on the following day in silence in group one; (b) immediately in silence for group two; and (c) immediately either while holding their mouth open slightly or while responding to casual conversation for groups three and four.
RESULTS: For group one the averaged SEBR values for the first and second recordings were 13.5 and 14.6 blinks/minute, and similar results were obtained for group two if the subjects were relaxed (for example 13.9 and 12.0 blinks/minute). A slight, but statistically significant, time-related decline in SEBR was usually noted. For non-relaxed (restless) subjects exhibiting spontaneous mouth and jaw movements while being videographed, the averaged SEBR values were around 27 blinks/minute. For groups three and four, analyses of those individuals who managed to maintain a mouth open posture for the video recordings, the averaged SEBR was 7.2 blinks/minute, while those engaged in casual conversation had an averaged SEBR of 20.3 blinks/minute.
CONCLUSIONS: Mouth and jaw movements and a non-relaxed state can substantially affect spontaneous eye blinking.
METHODS: Repeat video recordings of five minutes duration were made on 76 young adult emmetropic subjects aged 18-25 years. The subjects were instructed to direct their gaze horizontally toward a distant target with the entire cornea of the left eye illuminated with a broad beam cobalt blue light. Repeat recordings were made: (a) on the following day in silence in group one; (b) immediately in silence for group two; and (c) immediately either while holding their mouth open slightly or while responding to casual conversation for groups three and four.
RESULTS: For group one the averaged SEBR values for the first and second recordings were 13.5 and 14.6 blinks/minute, and similar results were obtained for group two if the subjects were relaxed (for example 13.9 and 12.0 blinks/minute). A slight, but statistically significant, time-related decline in SEBR was usually noted. For non-relaxed (restless) subjects exhibiting spontaneous mouth and jaw movements while being videographed, the averaged SEBR values were around 27 blinks/minute. For groups three and four, analyses of those individuals who managed to maintain a mouth open posture for the video recordings, the averaged SEBR was 7.2 blinks/minute, while those engaged in casual conversation had an averaged SEBR of 20.3 blinks/minute.
CONCLUSIONS: Mouth and jaw movements and a non-relaxed state can substantially affect spontaneous eye blinking.