Field-of-View Evaluation of the Preplanned Product Improvement Visual Correction of the M40 Protective Mask
Abstract
The purpose of this study was to evaluate the field-of-view (FOV) of a proposed preplanned product improvement (p3I) visual correction for the M40 protective mask. Two prototype mounting brackets for the p3I visual correction were used in the investigation: one with an eye well loop and the other with a Velcro strip. It was found that the proposed p3I visual correction provides the same FOV as its predecessor despite its larger size. The failure of the proposed p3I visual correction to provide a larger FOV was determined to be excessive vertex (eye to visual correction) distance. In addition, it was found that there was no difference between the FOVs obtained with either of the two mounting brackets. The study identified a problem of excessive vertex distance when the P(3)I visual correction is worn inside M40 mask sizes small and large.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1992
- Accession Number
- ADA249637
Entities
People
- John C. Kotulak
- John K. Crosley
Organizations
- United States Army Aeromedical Research Lab