David was wearing the glasses that weekend

David was wearing the glasses that weekend

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Further to the above the optometrist Gordon Sanderson in the original trial testified that the lenses in the glasses were similar to those which had been prescribed in October 1992. Is it possible that David had a spare pair in the house which never came to light? I am unsure because David had tripped and fallen outside his music teacher's house a few days before the murders and had to be taken home because his glasses had been damaged then.