When the breeders are paired, many factors of the pigeon's eye have a certain reference. Although many pigeon eye theories are not applicable to every pigeon, the value of the pigeon eye is relatively high under a certain pedigree, and it is indeed very beneficial when paired. Breeding pairs, the eye of the pigeon can take these issues into account.
First, if you want the pigeon eye sand to change less and can be better inherited, then you can consider pairing the same eye sand and similar eye sand pigeons. In this way, the offspring are generally similar to the eye sand and will not change much. Then the corresponding genes can be passed on better.
Secondly, if the pigeons are not fast and you want to increase the speed of the pigeons, then it is a good idea to have a different combination. Or in some inbred pairs, differential mating is a good practice to reduce degradation. For example, thick eye sand can be paired with thinner eye sand, for example, yellow eyes with sand hole is a good choice.
Thirdly, the general breeding pigeon pairing, if you consider the breeding of pigeons, you have to do breeding. Then it is generally not considered to pair pigeons with thin eye sand, and strictly not to pair pigeons with thin eye sand. Avoid further dilution of the offspring's eye sand, which is easy to distort.