| http://www.w3.org/ns/prov#value | - The instrument of claim 5,wherein said window is a period of time corresponding to any one of the following approximate distance ranges: 1.5 to 5 mm. behind the corneal surface, corresponding to the anterior lenticular surface; 1.5 to 6.5 mm. behind the anterior lenticular surface, corresponding to the posterior lenticular surface; 18.5 to 29.0 mm. behind the corneal surface, corresponding to the
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