The task order objectives for the ad hoc committee of the National Academies of Sciences, Engineering, and Medicine are to review the latest published research and science and produce a report addressing best practices and known limitations in the use of visual perimeter devices to measure visual field loss in connection with disability evaluations, including:

1. Describing the current practice landscape for the measurement of visual field impairment with visual perimeter devices, and recent changes or challenges in the provision of such care; and
2. Answering the following questions based on published evidence (to the extent possible) and professional judgment (where published evidence is lacking):
   1. Is optical projection of the testing stimuli still a necessity to achieve valid and reliable results from a perimeter? How does the eye respond differently to projected stimulus vs. other types (e.g., LCD screens)?
   2. Do perimeters using Frequency Doubling Technology produce substantially similar results to traditional perimeters and what differences are there?
   3. Is automatic kinetic perimetry a valid and reliable method of measuring visual field loss? What are the necessary device specifications and testing circumstances for automatic kinetic perimetry to produce valid and reliable visual field testing?
   4. What are the most widely acceptable and commonly used alternatives to kinetic perimetry, both manual and automated, for the measurement of visual field efficiency? What impacts do such alternative methods have on the validity and reliability of testing results?
   5. From a medical and practical perspective, is it still necessary for SSA to require three published clinical validation studies to find a perimeter acceptable or could fewer studies potentially show validity with similar reliability? If fewer validation studies could be acceptable, would there be higher requirements on the design or execution of those studies?
   6. What devices, techniques, and standards are other federal agencies using to make statutory blindness determinations based on visual field loss?

The report will include findings and conclusions but not recommendations.