Is it permissible to perform ablution (wudu') over socks in the mosque due to a physical defect in the toes?

Ablution (Wudu') is not valid if there is a barrier preventing water from reaching the ablutionary organs. Therefore, ablution with socks is not sufficient if they prevent water from reaching the skin. One can avoid this difficulty by performing ablution at home or in a private place. It is also permissible to wear socks after having performed ablution and then wipe over them when performing ablution in the mosque.