What lighting level is associated with preventing signs of photopic retinopathy in albino rodents?

What lighting level is associated with preventing signs of photopic retinopathy in albino rodents?

• A. 100 lux
• B. 10 ft candles
• C. 30 ft candles / 325 lux measured 1 meter above the floor
• D. 60 ft candles

Answer: (C)

Albino rodents are especially vulnerable to light-induced retinal damage because they lack pigment that helps protect the eye. To prevent signs of photopic retinopathy, you want a moderate level of illumination that lets you observe and work with the animals without continuously exposing their retinas to bright light. The recommended level is 30 ft candles, which equals about 325 lux, measured one meter above the floor. Measuring at that height standardizes lighting across cages and room setups, giving a consistent exposure for the animals. Lower levels (around 100 lux or 107 lux) would make observations harder, while higher levels (such as 60 ft candles, about 645 lux) would increase the risk of retinal damage over time. So, maintaining roughly 325 lux at a standard height is the best balance for preventing photopic retinopathy in albino rodents.

Albino rodents are especially vulnerable to light-induced retinal damage because they lack pigment that helps protect the eye. To prevent signs of photopic retinopathy, you want a moderate level of illumination that lets you observe and work with the animals without continuously exposing their retinas to bright light. The recommended level is 30 ft candles, which equals about 325 lux, measured one meter above the floor. Measuring at that height standardizes lighting across cages and room setups, giving a consistent exposure for the animals.

Lower levels (around 100 lux or 107 lux) would make observations harder, while higher levels (such as 60 ft candles, about 645 lux) would increase the risk of retinal damage over time. So, maintaining roughly 325 lux at a standard height is the best balance for preventing photopic retinopathy in albino rodents.