optically

enUK

op·ti·cal

O0100700 (ŏp′tĭ-kəl)adj.1. Of or relating to sight; visual: an optical defect.2. Designed to assist sight: optical instruments.3. Of or relating to optics.4. Relating to or using visible light: optical astronomy.5. Using light-sensitive devices.
op′ti·cal·ly adv.
Thesaurus
Adv.1.optically - in an optical manner; "optically distorted"