(1) Any half-monthly payment payable under this Chapter, either under an agreement between the parties or under the order of a competent authority, may be reviewed by the competent authority, on the application either of the employer or of the employee accompanied by the certificate of a medical practitioner that there has been a change in the condition of the employee or, subject to such conditions as may be prescribed by the State Government, on application made without such certificate.
    (2) Any half-monthly payment may, on review under this section, subject to the provisions of this Chapter, be continued, increased, decreased or ended, or if the accident is found to have resulted in permanent disablement, be converted to the lump sum to which the employee is entitled less any amount which he has already received by way of half-monthly payments.