Selecting the appropriate filter to minimize eye discomfort and maximize visual resolution is dependent on an individual sense of what ‘helps’. As a rule of thumb for a successful vision assessment, determining the best filter requires balancing light sensitivity issues with appropriate filter color selection.

Increased Mobility

By reducing overall light transmission and eliminating bothersome frequencies of light, the NoIR filter system often increases mobility and provides relief from the light-sensitivity, glare and discomfort related to the onset of macular degeneration and other vision-impairing eye conditions, including night-blindness.

Spectral Absorption

All NoIR filters absorb ultraviolet radiation (UV A, B and C) to 400nm—radiation that is causally related to cataract formation. Many NoIR filters absorb additional visible light energy to provide a more comfortable viewing experience. This visible absorption protects the retina against long-term exposure to high-energy wavelengths, which are associated with the deterioration of the center of the retina and may contribute to macular degeneration.

Absorption Technology

NoIR filters relieve glare by absorbing the short wavelengths of the visible spectrum that can scatter within the ocular media, and allowing only the longer wavelengths to reach the retina. Not only is this absorption of energy the most effective way to reduce glare, it also has the effect of enhancing contrast by highlighting visual distinction.

Visible Light Transmission

The NoIR filter system manages overall visible light transmission (VLT) to allow the proper amount of light energy to reach the eyes. The NoIR Filter System includes a full range of lenses (spanning 90% to 1% VLT), accommodating all levels of photosensitivity. Many people require different filter transmissions for cloudy and bright conditions or for inside versus outside applications.

NoIR Filter Technology

• UVShields—offering UV and Visible spectrum protection.
  
• NoIRs—offering UV, Visible and Infrared protection (for cooling relief from the heat-energy of the sun).
  
• GlareShields—a series of filters offering UV and Visible Spectrum protection and matching the Corning CPF Glare Cutter product line. GlareShields are an affordable option for those who benefit from but cannot afford Corning products.
  

NoIR Evaluation Process

Selecting the appropriate filter to minimize eye discomfort and maximize visual resolution is dependent on an individual sense of what ‘helps’. As a rule of thumb for a successful vision assessment, determining the best filter requires balancing light sensitivity issues with appropriate filter color selection.

Evaluation Tips:

• For maximized visual acuity, select the highest visible light transmission (VLT) possible within a group of filter colors appropriate for the eye disorder. Then, working from lightest to darkest, offer companion products until the patient responds favorably. Use a method of trial and error with various filter colors and visible light transmissions to determine the filter.
  
• Where possible, allow for outdoor testing of colors.