47. The following are major functional deficiencies:
(1) severe visual deficiency: visual acuity in each eye, after correction by means of appropriate ophthalmic lenses, excluding special optical systems and additions greater than 4.00 dioptres, is not more than 6/21, or the field of vision in each eye is less than 60 degrees in the 180-degree and 90-degree meridians and, in either case, the person is unable to read, write or move about in a familiar environment;
(2) severe hearing deficiency: the ear having the greater hearing capability is affected by a hearing deficiency evaluated, according to American National Standards Institute Standards S3.6-1989, to be an average of at least 70 decibels, in aerial conduction, on any of the 500, 1,000 or 2,000 Hertzian frequencies;
(3) a motor deficiency, if it results in significant and persistent limitations for the student in the performance of his or her daily activities: loss, malformation or abnormality in the skeletal, muscular or neurological systems responsible for body motion; and
(4) an organic deficiency, if it results in significant and persistent limitation for the student in the performance of his or her daily activities: disorder or abnormality in the internal organs forming part of the cardiorespiratory, gastrointestinal and endocrinal systems.