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MEASURE AND COMPUTATION OF LOSS (Cont.)

a. All directions of gaze shall be tested from the extent of diplopia, with a test light on the perimeter at 300mm or on a tangent screen at a distance of one meter from the eye.

b. Reference is made to the AMA Guides for description of plotting requirements for the test results; (see Figure 1)

c. The percentage loss of ocular motility is the sum of the percentages of loss on motility due to diplopia in the meridian of maximum impairment. This percentage is assigned to the injured eye, or in the case of bilateral injury to the eye with the greatest impairment of CVA and VF. This is considered to be the eye with the greatest loss of CVA and the greatest loss of visual field and the percentage loss of ocular motility in the contralateral eye is considered to be 0, and for purposes of calculation, a value of 0 is deemed to be 1%.

IMPAIRMENT OF EYE The visual impairment of one eye is the combination of the percentage losses of CVA, of VF, and of OM. To determine this, the visual loss is combined with the field loss for each eye. The loss in the eye that is greater is then combined with the loss of ocular motility.Each of the following conditions present due to the injury causes an increase in the impairment rating of 2%.

a. Loss of color vision

b. Loss of adaptation to light and dark

c. Metamorphopsia

d. Uncorrected entropion or ectropion

e. Lagophthalmos

f. Epiphora

g. Muscle disturbances such as tics, not included under diplopia.

If glasses are required as a result of the injury, or if refractive error increases by at least one diopter of sphere, cylinder, or both, 5% is added to the impairment rating.If a non-cosmetic contact lens is required as a result of the injury, 7% is added to the impairment rating.

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