Linked from
The 18 pages that link to Spatial frequency, each with the reason it gives.
Image resolutionRelated: Resolution limits the finest patterns an image can represent.
WavenumberNarrower topic: Wavenumber is a standard way to quantify spatial frequency.
Peripheral visionRelated: Peripheral vision is less effective at resolving high spatial frequencies.
Wave vectorNarrower topic: Wave vector magnitude is the angular form of spatial frequency.
High resolutionBroader topic: Fine spatial detail corresponds to high-frequency patterns.