This is a guess arrived at after searching various combinations of the terms laajennettu, värikalvo, kiinnikkeet. It seems the most likely target terms for these in this context would be dilated (referring to dilation of the pupil in order to examine the eye), iris, synechiae. The phrase could refer to the dilation procedure itself, which is most commonly done with tropicamide (T) and phenylephrine (a.k.a. metaoxedrine, M) as described in section 7.2.1 of the linked Finnish text. I would be quite confident about "Dilated" for "Laajennettu", but if you can’t find any other clues in the source text, it may be safest to leave T and M as is or add a note that they are unidentified abbreviations.