The commissioners of any community ditch in New Mexico, shall have power according to their discretion if they deem it proper, to allow a blind person or his surviving spouse to irrigate free of charge any portion of land not to exceed three acres. Provided, that the parties to whom the privilege may be granted as herein stated, shall have an interest and water right in the ditch, and shall be subject to the use of the water as per the orders of the mayordomo or superintendent of the ditch.