Relationship between visual perception and functional visual

By Richard Davis,2014-04-17 23:20
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Relationship between visual perception and functional visual



    *Songül Atasavun Uysal, PT, MsC., **Ayşe Turan, MD

    (*Hacettepe University School of Physical Therapy and Rehabilitation Ankara/Turkey)

    (** Turkish Consulate General, NY)

    Visual perception is so important thing to take information about the world around us. Perception is learned experiences and practice and through stimulation from the enviroment. The development of visual perception begins at birth with the reception of stimuli, followed by orientation of the head and eyes and the identification and integration of dominant cues (1,2,3,4). In the developing child, there is a systematic increase in the ability to perceptually analyze and discriminate objects. The visual perception development is identified by age. For example; figure-ground perception improves from 3 to 5 years, form constancy development shows dramatic improvement from ages 6 to 7 and position in a space development is a complete at 7 to 9 years (5).

    Children with low vision take unusal visual information and limitations of visual analysis and memory when critical details are missing. Therefore; their visual perception stimulans are delayed to take unsufficient information.

    Lack of data about the visual perception affects the individual’s capacity to perform

    their activities at school, home and in other things. Examples of these activities; copying from a blackboard, handwriting and cutting with scissors. As a result of these problems, significantly effect with childrens activities and inability to comply with.


     This study was planned to detect relationship between visual perception and functional visual questionnaire in children with low vision.

    Subjects and Methods:

    The study was included a total of 16 low vision children whose mean age were 8,62? 1,99 years and attending a school. Visual perception functions were tested with Motor Free Visual Perception Test (MVPT- 3) and used to The LV Prasad-Functional Vision Questionnaire (LV-FVQ). MVPT which is formed totally 65 questions comprising subtitles such as visual memory, visual discrimination and form constancy. LV-FVQ consisting of 19 items was administered verbally. Responses for each item were rated on a 5-point scale. All the tests has reliability (6,7,8).


    Spearman’s Correlation Analysis was made in order to evaluate the relations between

    visual perception and functional visual questionnaire. It was found that there was a meaningful correlation statistically (Table 1).

    Table 1. The relations between visual perception and functional visual questionnaire

    MVPT- LV-FVQ r p

    Visual Discrimination And Difficulty in Reading Textbooks -0.82 0.002

    Visual Memory And Dificulty in Reading Textbooks -0.626 0.039

    Visual Closure And Difficulty in Identifying Colors 0.591 0.026

    Visual Discrimination And Difficulty in Find Locating Ball 0.624 0.010

    Total MVPT Score And Difficulty in Writing -0.652 0.016

     p< 0.05


    In our study we found that negative relationships in Visual discrimination and Difficulty in reading speed, Visual memory and Difficulty in reading textbooks and Total MVPT score and Difficulty in writing was found. As expected, one increases the other decreases. If the person has a problem in visual memory, they can not remember a word then they have a reading problem. We found positive relationships in Visual closure and Difficulty in identifying colors and Visual discrimitation and Difficulty in Find Locating Ball. That is, when person has a problem in the visual discrimination, have difficulty locating the ball.

    Vision can provided by distinguishing the visual differentiation from the environmental simulators. Functional vision defined as vision that can be used to perform a task requiring vision, that is how a person use their vision. According to loss of vision, visual perception, functional visual performance and visual motor control might decreases in low vision children.This affects negatively the reading and writing skills which needs intensive visual tasks. LV-Prasad functional visual performance test and MVPT are determined to school children’s

    problem early. Therefore, early detection is more important things to protect a functional vision and planning treatment program (6,7).

    Two test are preferable to use in occupational therapy and low vision therapy.


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