An ophthalmic surgical method comprising a step of at least partly removing the vitreous humour, which also comprises a step of highlighting the vitreous to be removed using a coloured composition which selectively highlights the vitreous, allowing a distinction between the vitreous and the other structures of the eye, said distinction facilitating vitreous removal, wherein the coloured composition comprises a polymeric dye comprising at least one backbone to which at least one reactive dye is chemically linked in a preferred embodiment the polymeric dye being a blue dextran.
