At what wavelengths is there a potential retinal hazard?

The potential retinal hazard primarily occurs due to exposure to light within the wavelength range of 400 to 1400 nm. This range includes both ultraviolet (UV) light and infrared (IR) light, which can cause damage to retinal tissues.

Wavelengths shorter than 400 nm fall into the UV category, which can lead to photochemical damage in the eye. Conversely, longer wavelengths beyond 700 nm extend into the infrared spectrum. While infrared light is typically associated with thermal effects rather than photochemical damage, it can still contribute to retinal heating and potential injury if exposure is prolonged.

Hence, the answer that includes the full spectrum of light related to possible retinal hazards is the range of 400 to 1400 nm, encompassing both the ultraviolet and infrared regions, making it the correct choice for this question.