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Seafarers Rehabilitation and Compensation Act 1992 – Guide to the Assessment of the Degree of Permanent Impairment Edition 3.0
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Seafarers Rehabilitation and Compensation Act 1992 – Guide to the Assessment of the Degree of Permanent Impairment Edition 3.0
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164 These steps are based upon the following formulae:
165 Diplopia within the central 30° is measured by an ophthalmologist with a tangent screen. Unless there is diplopia within 30° of the centre of fixation, the diplopia does not cause significant visual impairment. The exception is when looking downwards. Double vision within the central 20° signifies the maximum loss of ocular motility (that is, a 50% loss of ocular motility in one eye).
166 If the diplopia is not within the central 20°, the presence of diplopia is then plotted along the 8 meridians (see Figure 6‑E: Percentage loss of ocular motility of one eye in diplopia fields). The largest percentage on any of the meridians in which there is double vision is the impairment percentage for loss of ocular motility.
Figure 6-E: Percentage loss of ocular motility of one eye in diplopia fields
Adapted from AMA4 (Chapter 8, page 217).
167 If an ocular adnexal disturbance or deformity interferes with visual function and is not reflected in diminished visual acuity, decreased visual fields, or ocular motility abnormalities with diplopia, then the significance of the disturbance or deformity should be evaluated by an examining ophthalmologist. In that situation, using the combined values chart (see Appendix 1), an ophthalmologist may combine up to an additional 10% impairment for each affected eye.
168 Problems in the visual system should also be taken into account where they result in symptoms such as epiphora, photophobia, metamorphopsia, and convergence insufficiency.
169 Using the combined values chart (see Appendix 1), an additional WPI of up to 10% may be combined with WPI ratings for conditions such as permanent deformities of the orbit, scars, and other cosmetic deformities that do not otherwise alter ocular function.
170 Figure 6-F: Calculation of visual system impairment for both eyes (from the AMA4) was established using the equation: