The amount of light required to cause damage to the human eye or to potentially cause blindness depends on various factors, including the intensity of the light, the duration of exposure, the wavelength or color of the light, and the individual's susceptibility to damage.
The human eye is most sensitive to light in the visible spectrum, particularly in the green and yellow regions. However, exposure to intense light, regardless of color, can be harmful.
To provide a general guideline, exposure to bright light sources, such as the sun or intense artificial lighting, should be limited to avoid potential damage to the eyes. Staring directly into the sun, for example, can cause significant harm, including permanent damage to the retina.
When it comes to specific power levels or watts, it is challenging to provide an exact threshold that universally applies to all individuals. The damage caused by light is typically related to the intensity of the light rather than the power or wattage alone. The measure of intensity is typically expressed in units such as lux or candela per square meter.
Exposure to intense light sources, such as powerful lasers or extremely bright industrial lights, can potentially damage the retina and cause vision impairment or blindness. The power thresholds for such light sources can vary, but it is generally accepted that exposure to laser beams with power levels in the range of milliwatts (mW) or higher can pose a risk to the eyes. However, the specific threshold for damage can depend on factors such as the duration of exposure and the characteristics of the laser beam (e.g., wavelength).
It is important to prioritize eye safety and protect your eyes from excessive or intense light sources. If you have concerns about potential eye damage or require specific safety information regarding a particular light source, it is advisable to consult with an eye care professional or relevant experts in the field of eye safety.