ALBERTA PERMANENT CLINICAL IMPAIRMENT GUIDE - Workers ...

VISIONE. Combine the impairments in A, B, C & D to obtain the post injury visualimpairment.F. Calculate the pre-existing impairment by following steps A, B, C & D usingpre-accident information.G. Subtract the pre-existing impairment rating from the post injury rating (E & Fabove) to obtain the impairment rating for the compensable injury (seeExample 1, page 43).III.Specific Rules in RatingA. If the pre-accident best corrected visual acuity is indeterminate, and thecompensable injury has affected the visual acuity of only one eye, the preaccidentbest corrected visual acuity of each eye is assumed to have beenthe same as the current corrected visual acuity of the uninjured eye.B. If the pre-accident best corrected visual acuity is indeterminate and thecompensable injury has affected the visual acuity of both eyes, no preexistingvisual impairment is assumed.C. Non-classified visual impairments are assessed based on Schedule I , page44.D. Impairment due to aphakia or pseudoaphakia is assessed based onimpairment of best corrected visual acuity, and/or non-classified visualimpairments.E. Intractable diplopia in all fields of gaze is assessed at the level of completeloss of vision in one eye.Page 41COPYRIGHT 2006 All Rights Reserved October 1, 2006