The cosmonauts were given different test tables for determining the acuteness of eyesight, the possibility to distinguish colours and to switch eyesight from one object to another while in flight.
ЦВЕТООЩУЩЕНИЕ
Русско-английский перевод ЦВЕТООЩУЩЕНИЕ
Русско-Английский словарь идиом по космонавтике. Russian-English dictionary of idioms on cosmonautics. 2012