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Marco-Nidek ARK-730A Marco has added the ARK-730A, offering several enhanced features, to its line of automated refractors/keratometers. The ARK-730A provides fully automatic alignment, tracking and focusing to ensure reliable and repeatable data for refractive measurements and keratometry. The ARK-730A also allows the operator to take peripheral keratometric measurements including sagittal radius and eccentricity values used in corneal evaluations for contact lens fitting and refractive surgery evaluations.