Retinal ganglion cells and LGN cells have symmetrical circular receptive fields
According to (Priebe, 2016), Retinal ganglion cells and LGN cells have symmetrical circular receptive fields. Most dramatic transformations via receptive fields happen in the V1.
Source: Priebe, N.J. (2016) ‘Mechanisms of Orientation Selectivity in the Primary Visual Cortex’, Annual Review of Vision Science, 2(1), pp. 85–107. Available at: https://doi.org/10.1146/annurev-vision-111815-114456.
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