Affordability - Based on initial expenditure, need to repair vs replace, warranty and accessories.

Capability - Based on protectin fog resistance (i.e. design factors), lens versatility and overall design.

Deployability - Based on ease of deployment and transportation.

Maintainability - Based on cleaning, decontamination and storage requirements; customer service, and repairs.

Usability - Based on fog resistance (i.e. transition in different environments), user friendliness, field of vision, appearance and equipment compatibility.