SRD:Eyes of Expanded Vision
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Eyes of Expanded Vision: These crystal lenses fit over the user’s eyes to expand his field of vision. Flanking opponents gain only a +1 bonus when attacking the user instead of +2 (rogues still get their full sneak attack damage because the wearer is still flanked). The wearer gains a +1 enhancement bonus on Spot checks but takes a –2 penalty on saves against gaze attacks.