A genetic predisposition to a condition (such as keratoconus) that may never manifest is not a 'pre-existing condition or abnormality' attracting a deduction under s 68A(1) of the Workers Compensation Act 1987 (NSW); the employer bears the burden of proving that the condition had progressed beyond mere predisposition. An assessment of the proportion of a most extreme case under s 67 is ordinarily a question of fact and degree not reviewable on appeal in point of law.
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