Ophthalmology General 818d07bb Tonography helps you to determine: A The rate of formation of aqueous B The facility of outflow of aqueous C The levels of intraocular pressure at different times. D None of the above High-Yield Explanation Tonography is a noninvasive technique for determining the facility of aqueous outflow. Ref: Parson's Diseases of The Eye, 18th Edition, Page 7226