A kit comprising an activity-specific object and corresponding activity-specific eyewear, wherein the eyewear comprises: a lens having a spectral transmittance that includes: an object-contrast spectral window that extends from about 440 nm to 470 nm and corresponds to a light spectrum produced by a contrast agent provided on the activity-specific object; a background spectral window to transmit radiation received from the background, the background spectral window extending from 510 nm to 580 nm, thus excluding the spectral absorptions of chlorophyll a and chlorophyll b that contribute to vegetation appearance; and a spectral-width window, extending from about 610 nm to about 720 nm, so as to provide a natural appearing scene as viewed with the filter and to provide a broader spectral bandwidth to a user, each spectral window (202, 204, 206) comprising a spectral region in which the optical filter transmits, the width of each spectral window (202, 204, 206) being defined as a full width at about 50%, 25%, 10% or 5% of the maximum transmittance within the spectral window (202, 204, 206); and a frame configured to retain and situate the lens so that a wearer views through the lens with the eyewear as worn and the lens provides improved perception of vegetation while enhancing the visibility of the activity-specific object. a lens having a spectral transmittance that includes: an object-contrast spectral window that extends from about 440 nm to 470 nm and corresponds to a light spectrum produced by a contrast agent provided on the activity-specific object; a background spectral window to transmit radiation received from the background, the background spectral window extending from 510 nm to 580 nm, thus excluding the spectral absorptions of chlorophyll a and chlorophyll b that contribute to vegetation appearance; and a spectral-width window, extending from about 610 nm to about 720 nm, so as to provide a natural appearing scene as viewed with the filter and to provide a broader spectral bandwidth to a user, each spectral window (202, 204, 206) comprising a spectral region in which the optical filter transmits, the width of each spectral window (202, 204, 206) being defined as a full width at about 50%, 25%, 10% or 5% of the maximum transmittance within the spectral window (202, 204, 206); and an object-contrast spectral window that extends from about 440 nm to 470 nm and corresponds to a light spectrum produced by a contrast agent provided on the activity-specific object; a background spectral window to transmit radiation received from the background, the background spectral window extending from 510 nm to 580 nm, thus excluding the spectral absorptions of chlorophyll a and chlorophyll b that contribute to vegetation appearance; and a spectral-width window, extending from about 610 nm to about 720 nm, so as to provide a natural appearing scene as viewed with the filter and to provide a broader spectral bandwidth to a user, each spectral window (202, 204, 206) comprising a spectral region in which the optical filter transmits, the width of each spectral window (202, 204, 206) being defined as a full width at about 50%, 25%, 10% or 5% of the maximum transmittance within the spectral window (202, 204, 206); and a frame configured to retain and situate the lens so that a wearer views through the lens with the eyewear as worn and the lens provides improved perception of vegetation while enhancing the visibility of the activity-specific object.