To look at an eclipse is never more dangerous than to look at the normal sun. Sun has uv radiation that can damage the light receptors of the retina. During the noon the sun is directly above our head; sunlight has to travel a short distance through our atmosphere and hence more UV photons that enter our eyes.
During sunrise or sunset, sunrays have to travel a much longer distance through the atmosphere. A lot of UV and other photons are scattered and filtered before they reach our eyes and hence sunlight is much dimmer compared to at noon.
During eclipse' the number of photons are even less than the normal sun. Hence, safer. Although it would only be safe to look at the sunrise/eclipse during sunrise for a few seconds, it is not advisable to do so. You should use some extra safety (solar filters) when looking at an eclipse.