COMPARATIVE STUDY OF VISUAL REACTION TIME AND FIELD OF VISION IN DEAF CHILDREN WITH NORMAL CHILDREN

Dr. Nitin.Bhalchandra Joshi; Dr. Mrs. Ruth.Nitin Joshi

Volume : IX, Issue : IX, September - 2019

COMPARATIVE STUDY OF VISUAL REACTION TIME AND FIELD OF VISION IN DEAF CHILDREN WITH NORMAL CHILDREN

Dr. Nitin. Bhalchandra Joshi, Dr. Mrs. Ruth. Nitin Joshi

Abstract :

With auditory deprivation the visual senses are enhanced in the deaf children. The visual reaction time is measured by response analyzer and the field of vision is tested by Priestly–Smith‘s perimeter in the deaf children and compared with the normal heå children in the age group of 8–16 years. The results showed significant increase in the VRT and field of vision in the deaf children as compared to the normal children. Early deafness is responsible for processing the visual stimuli in auditory cortex due to plasticity of neuronal cells in the auditory cortex. The deaf depend on the visual stimuli to judge three dimensional objects as well as to moving stimuli in the periphery. The deaf children show faster VRT and widening of field of vision due to continuous training by sign language. Visual experiences to the deaf children improve the neuronal circuitry involved thus providing evidence of auditory plasticity.