What Is Visual Resolution?
The finest detail the visual system can resolve or distinguish. It is typically expressed as a minimum angle of resolution (MAR) and is the inverse of visual acuity.
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Limiting Factors
Resolution is limited by the density and size of the cone photoreceptors in the fovea, the precision of the eye's optics (aberrations), and the subsequent neural processing limits.
Acuity Relationship
Visual acuity is measured by determining the smallest object (e.g., the letter "E") that can be resolved. A $20/20$ acuity corresponds to a MAR of $1.0$ arcminute.
Application
Critical for tasks requiring fine detail, such as reading small print, identifying faces, or performing microsurgery.
What limits the resolution of the eye?
The diffraction limit of the pupil and the spacing of the cone photoreceptors in the fovea are the ultimate limiting factors.
Does peripheral vision have high resolution?
No. Resolution drops dramatically in the periphery because cone density decreases and individual photoreceptors share neural pathways (larger receptive fields).
How is it measured in optics?
In technical optics, resolution is often measured by the Modulation Transfer Function (MTF), which quantifies the system's ability to transfer contrast at various spatial frequencies.