Centaurus
There's nothing like early descent/late descent or different in day or night. There is only one position for descent and pilot cannot play with it. If visibility is a problem then it should not be continued. Below from JAR OPS:
A descent below MDA/H should not be initiated until the threshold of the runway to be used has been identified and the aeroplane is in a position to continue with a normal rate of descent and land within the touchdown zone.