also  di*op*tri*cal  adj 1  :  producing or serving in refraction of a beam of light  :  REFRACTIVE : specif  :  assisting vision by refracting and focusing light <the power of a lens>   2  :  produced by means of refraction <the images of objects in space that are formed on the retinas of the two eyes -Otto Glasser>  di*op*tri*cal*ly adv 
 
 
 
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