VISOR is a device used to transmit images directly into the brain of the wearer and is used in the fictional Star Trek universe by Geordi LaForge to see. VISOR is a backronym for Visual Instrument and Sight Organ Replacement.
... and
means "they are in me".
"-aham" (I) in the second line is nominative. na caaham =
"...and not I....", meaning "but I am not...".
"teshv-" (in/at/by them) a ...