Which type of cones are absent in the fovea?

The fovea is a specialized area in the retina known for high-acuity vision and is densely populated with photoreceptor cells, particularly cones. In the fovea, the concentration of L (long-wavelength) cones and M (medium-wavelength) cones is very high, while S (short-wavelength) cones are indeed absent.

This absence of S cones contributes to the enhanced resolution and sensitivity to red and green light in the fovea, allowing for detailed color vision in well-lit conditions. The adaptation of the fovea for acute vision means it optimizes the presence of the L and M cones, which are more effective in the ranges of light most prevalent in natural daylight. Thus, identifying that S cones are absent is accurate in this context.

Understanding the distribution of different cone types is crucial for comprehending how the human visual system processes color and detail in different lighting conditions.