| http://www.w3.org/ns/prov#value | - In some embodiments, focus plate 194 (made of glass, plastic, or other material transparent to the light wavelengths of interest) is of a thickness such that when lens 115 is pressed on one face of focus plate 194 with stimulation light being emitted, and the other face of focus plate 194 is pressed onto nerve 69, the light is focussed to a spot size that is desired.
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