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Functional differences between HD and LED RGCs
| RF center size | Polarity in darkness | Polarity in photopic range | Response kinetics | Speed sensitivity | Object motion sensitive | |
|---|---|---|---|---|---|---|
| HD1 | 116 μm | ON-dominant | ON-dominant | ON–OFF-transient | Low-medium | Yes |
| HD2 | 268 μm | OFF-dominant | OFF-dominant | ON-transient; OFF-sustained | Invariant | No |
| UHD | 89 μm | Equal | OFF-dominant | ON–OFF-transient | Very low | No |
| LED | 143 μm | ON-dominant | OFF-dominant | ON–OFF-sustained | Low-medium | Yes |
