Peristat is the most clinically validated online perimetry vision test. Macustat is a visual acuity and macular function test. Our clinically validated Peristat perimetry was the first online perimetry for telemedicine and professional use. Macustat is a 3-minute visual acuity and macular function test. With KeepYourSight, eye doctors can connect with their patients and offer ancillary online vision testing anywhere, anytime.