Which of the following statements regarding glare are correct?

I) When a dim source of light is in the direct line of sight, it may produce glare.

II) Glare will increase sensitivity.

III) Glare will decrease sensitivity.

IV) When a very bright source of light is in the direct line of sight, it may produce glare.

The correct answer is Statement III and IV.

Key Points

• Glare is a visual condition in which there is excessive and uncontrolled brightness that can cause discomfort and impair vision.
• When a very bright source of light is in the direct line of sight, it typically produces glare, making it difficult to see.
• Glare can decrease sensitivity by reducing the ability to perceive contrast, which affects overall vision clarity.
• Glare does not increase sensitivity; rather, it impairs vision by causing discomfort and reducing visual acuity.

 Additional Information

• Dim source of light
  • A dim source of light generally does not cause glare because it does not produce the excessive brightness required to create glare.
  • Glare is typically associated with bright light sources that overwhelm the eye's ability to adjust and see clearly.
• Sensitivity
  • Sensitivity in vision refers to the ability to detect small changes in brightness or contrast.
  • Glare reduces sensitivity by making it harder to distinguish between different levels of light and dark.