ABSTRACT
Background: Blind people are underprivileged from visual experience and visual imaginary that result them to become more dependent on haptic system for the job of tactile perception. Thus, the self-guided tactile investigation in blind individuals enables them to recognize the shapes more rapidly than the sighted counterparts. Aim and Objectives: The aim of the study was to see the increased tactile perception among the blind than the blind folded sighted subjects. Materials and Methods: The study was carried out on 150 blind and 181 blindfolded sighted subjects. In this, each subject was instructed to arrange the aluminum oxide abrasive sand papers of different grit size having grade 60, 80, 100, 120, 140, 200, 240, 360, 400, and 600 from rough to smooth as fast and accurate as possible in seconds to express the functions of haptic sense. Results: The present study showed that the blind subjects had outperformed in terms of speed and accuracy of tactile perception. Conclusions: Lack of vision among blind individuals enables their brain to enhance the sense of vision and the previous tactile exposure and memories along with their regular practice enhance the touch perception in terms of speed and accuracy.
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Background: Reaction time refers to elapsed time between a given stimulus to an individual and its subsequent rapid voluntary response by the same individual. Mostly, it depends on processing of the stimulus, decision-making, and response programming. Aim and Objective: This study aims to see the effect of vision on auditory reaction time. Materials and Methods: For this study, two groups of subjects were taken. The first group contained 150 blind subjects and the second group contained 181 normal sighted subjects. Estimation of simple and choice auditory reaction time was done with the help of multiple-choice reaction time apparatus received from Inco Ambala Ltd. in sitting position. It has an accuracy of ±0.001 s. Three times auditory stimulus was given to each subject to record the reaction time. The minimum recorded time interval to the voluntary response was taken as final reading in each subject. Results: In this study, the blind subjects showed a mean simple and choice reaction time of 148.84 ± 14.43 and 304 ± 29.54, respectively, while the blindfolded normal subjects showed a mean simple and choice reaction time of 153.80 ± 15.84 and 314.19 ± 31.81, respectively. These were found to be statistically significant. Conclusions: Blind individuals commonly utilize tactual and auditory cues for information and orientation and they reliance on touch and audition, together with more practice in using these modalities to guide behavior, are often reflected in better performance of blind relative to sighted participants in tactile or auditory discrimination tasks.
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@#AIM: To explore the dynamic distribution of pupil size and center, the eccentricity distribution of corneal light reflection, and its correlation analysis about suitable for femtosecond laser combined with excimer laser <i>in situ</i> keratomileusis.<p>METHODS: Randomly selected 225 patients(407 eyes)who underwent femtosecond laser combined with excimer laser <i>in situ</i> keratomileusis at Yanbian University Hospital in 2019 from January to May, preoperative use of Wavelight Allegro Topolyzer Corneal Topography to measure the pupil size and center position, the German Wavelight EX500 excimer Laser(500Hz)records the deviation between the pupil center and the coaxially sighted corneal light reflex when the patient is supine. <p>RESULTS:The average displacement distribution between the center of the cornea and the center of the pupil is 0.322±0.194mm, and 64% of the eyes are ≤0.40mm. The average displacement distribution of P-Dist(the eccentricity between the pupil center and the coaxially sighted corneal light reflex point)is 0.225±0.102mm, and 80% of the eyes are ≤0.30mm. The coaxially sighted corneal light reflex point is mainly deviated to the superior temporal side of the corneal center(34%). The X-axis of the left eye in low light conditions: -0.061±0.084mm, and the X-axis of the right eye: -0.016±0.059mm(<i>P</i>=0.002)(the left eye shifted to the temporal side in the dark light). The corneal transverse diameter(WTW)was positively correlated with changes in pupil diameter(dark pupil diameter-bright pupil diameter)(<i>r</i>=0.270, <i>P</i><0.001).<p>CONCLUSION: The left eye should be adjusted to a position of the machining center within 0.061mm. If the cornea is too large, try to maintain a dark light environment during the operation to improve the efficiency of pupil matching. This study further confirms the necessity of rationally positioning the cutting center under different angle kappa states.
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OBJECTIVE:To explore a marketing mode that was in conformity with both market law and consumers'needs for health care products.METHODS:Problems in the marketing of health care products in China were overviewed and the causes were analyzed.RESULTS&CONCLUSION:The short-sighted behavior was a problem that couldn't be neglected in the development of health care products manufacturing businesses.A long-term development mechanism should be established ranging from brand accumulating,mode of marketing,product positioning to after-sale service and etc.