Abstract: An improved bowstring mounted peep sight used in archery improving archer's accuracy. The present invention preferred embodiment having a body generally horizontal within bowstring axis has through the body centrally located luminous color optic cross-pieces indexing the center of the peep sight aperture. The characteristic of the present invention optic cross-pieces fiber side lit attenuation allows the archer to easily see through the large aperture peep sight aligning forward bow sight pin on color cross-pieces sectional center aperture small highlighted index reference window. Small reference index window cross hair center provides consistent centering reference within the large aperture by proximal blur designed within Fiber Optic Peep Sight. A second characteristic is both peep sight embodiment and optic cross-piece fibers be further enhanced with florescent light collecting glow pigment, dyes or other color illuminating materials for increased viewing during less than desirable lighting conditions.