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Guidelines for evaluation of various disabilities and procedure for certification - VISUAL DISABILITY PDF Print E-mail
Tuesday, 23 August 2011 16:09
Article Index
Guidelines for evaluation of various disabilities and procedure for certification
Thoracic and Thoracolumbar Spine Injuries
Torso Imbalance
Guidelines for Evaluation of Permanent Physical Impairment in Amputees
Table - VIII
Definition of Multiple Disabilities
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  1. Definition: - Blindness refers to a condition where a persons suffers from any of the condition, namely,
    1. total absence of sight; or
    2. visual acuity not exceeding 6/60 or 20/200(snellen) in the better eye with best correcting lenses; or
    3. limitation of field of vision subtending an angle of 20 degree or worse;

  2. Low Vision: - Persons with low vision means a person a with impairment of vision of less than 6/18 to 6/60 with best correction in the better eye or impairment of field in any one of the following categories:-
    1. reduction of fields less than 50 degrees
    2. Heminaopia with macular involvement
    3. Altitudinal defect involving lower fields.

  3. Categories of Visual Disability: All with correction

    Category Better eye Worse eye % age impairment
    Category 0 6/9-6/18 6/24 to 6/36 20%
    Category I 6/18-6/36 6/60 to Nil 40%
    Category II 6/40-4/60 or field
    of vision 10o -20o
    3/60 to Nil 75%
    Category III 3/60 to 1/60 or field
    of vision 10o
    F.C. at 1 ft. to Nil 100%
    Category IV F. C. at 1 ft. to Nil
    field of vision 10o
    F.C. at 1 ft. to Nil 100%
    One eyed persons 6/6 F. C. at 1 ft. to Nil
    or field of vision 10o

    Note: F.C. means Finger Count

  4. Process of Certification
    1. A disability certificate shall be issued by a Medical Board duly constituted by the Central/State Government having, at least three members. Out of which, at least one member shall be a specialist in ophthalmology.
  1. Definition of Hearing: - A persons with hearing impairment having difficulty of various degrees in hearing sounds is an impaired person.
  2. Categories of Hearing Impairment.

    Category Type of Impairment D B Level Speech discrimination % age of impairment
    I Mild hearing Impairment DB 26 to 40
    dB in better ear
    80 to 100% in
    better ear
    Less than
    40% to 50%
    II (a) Moderate
    41 to 60 dB in
    better ear
    50 to 80%in
    better ear
    40% to 50%
    II (b) Serve hearing
    61 to 70 dB
    hearing Impairment
    in better ear
    40 to 50% in
    better ear
    51% to 70%
    III Profound hearing Impairment
    Total deafness
    71 to 90 dB

    91 dB and
    better ear/to
    Less than 40%
    in better ear
    Very Poor
    71% to 100%

    1. Pure tone average of learning in 500, and 2000 HZ, 4000 HZ by conduction (AC and BC ) should be taken as basis for consideration as per the test recommendations.
    2. When there is only as island of hearing present in one or two frequencies in better ear, it should be considered as total loss of hearing.
    3. Wherever there is no response (NR) at any of the 4 frequencies (500, 1000,2000 and 4000 HZ), it should be considered as equivalent to 100 dB loss for the purpose of classification of disability and in arriving at the average.
  3. Process of Certification
    A disability certificate shall be issued by a Medical Board duly constituted by the Central and the State Government. Out of which, at least, one member shall be a specialist in the field of ENT.


  1. Definition .-
    1. Impairment: An impairment in any loss or abnormality of psychological, physiological or anatomical structure or function in a human being.
    2. Functional Limitations: Impairment may cause functional limitations which are partial or total inability to perform those activities, necessary for motor, sensory or mental function within the range or manner of which a human being is normally capable.
    3. Disability: A disability, is any restriction or lack. ( resulting from an impairment) of ability to perform an activity in the manner or within the range considered normal for a human being.
    4. Locomotor Disability: Locomotor disability is defined as a persons inability to execute distinctive activities associated with moving both himself and objects, from place to place and such inability resulting from affliction of musculoskeletal and/or nervous system.
  2. Categories of Locomotor Disability
    The categories of locomotor disabilities are enclosed at Annexure-A.

  3. Process of Certification
    A disability certificate shall be issued by a Medical Board of three members duly constituted by the Central and the State Government, out of which, at least, one member shall be a specialist from either the field of Physical Medicine and Rehabilitation or Orthopaedics.

    Two specimen copies of the disability certificate for mental retardation and others (visual disability, speech and hearing disability and locomotor disability) are enclosed at Annexure-B.

    It was also decided that whenever required the Chairman of the Board may co-opt other experts including that of the members constituted for the purpose by the Central and the State Government.

    On representation by the applicant, the Medical Board may review its decision having regard to all the facts and circumstances of the case and pass such order in the matter as it thinks fit.


Last Updated on Thursday, 19 January 2012 15:24

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