A ophthalmologic replacement cassette configured for a utilization with an ophthalmological apparatus - in particular an interchangeable ophthalmological cassette coming into contact with patient liquid for an ophthalmic surgical device - with: ▪ at least one hard region as housing of the replacement cassette , in particular made of a hard plastic, ▪ at least one soft region , in particular made of a soft plastic, ∘ wherein the hard region and the soft region form inner liquid channels of the replacement cassette , and ∘ wherein the soft region forms a cassette-side pressure detection arrangement for determining a liquid pressure in at least one of the liquid channels, characterized in that the pressure detection arrangement in the replacement cassette is configured with: ▪ a pressure chamber , which is connected to one of the liquid channels, ▪ which pressure chamber has a flexible membrane outwardly, and ▪ which flexible membrane peripherally surrounds a coupling element , ▪ wherein the coupling element is configured with an at least partially circumferential recess in the coupling element , which is oriented substantially parallel to the membrane and to an insertion direction of the replacement cassette into the ophthalmological apparatus , which is configured in such a way that, as the replacement cassette is inserted substantially parallel to the membrane into the ophthalmological apparatus , an arm , shaped into a fork, of a force measuring arrangement of the ophthalmological apparatus engages substantially parallel to the membrane into the recess , in such a way that the coupling element is surrounded at least on two sides by the fork-shaped arm and a force effect on the membrane occurring in a direction substantially normal in relation to the membrane is detectable by the force measuring arrangement both in a positive and in a negative direction. ▪ at least one hard region as housing of the replacement cassette , in particular made of a hard plastic, ▪ at least one soft region , in particular made of a soft plastic, ∘ wherein the hard region and the soft region form inner liquid channels of the replacement cassette , and ∘ wherein the soft region forms a cassette-side pressure detection arrangement for determining a liquid pressure in at least one of the liquid channels, ∘ wherein the hard region and the soft region form inner liquid channels of the replacement cassette , and ∘ wherein the soft region forms a cassette-side pressure detection arrangement for determining a liquid pressure in at least one of the liquid channels, ▪ a pressure chamber , which is connected to one of the liquid channels, ▪ which pressure chamber has a flexible membrane outwardly, and ▪ which flexible membrane peripherally surrounds a coupling element , ▪ wherein the coupling element is configured with an at least partially circumferential recess in the coupling element , which is oriented substantially parallel to the membrane and to an insertion direction of the replacement cassette into the ophthalmological apparatus , which is configured in such a way that, as the replacement cassette is inserted substantially parallel to the membrane into the ophthalmological apparatus , an arm , shaped into a fork, of a force measuring arrangement of the ophthalmological apparatus engages substantially parallel to the membrane into the recess , in such a way that the coupling element is surrounded at least on two sides by the fork-shaped arm and a force effect on the membrane occurring in a direction substantially normal in relation to the membrane is detectable by the force measuring arrangement both in a positive and in a negative direction. <EOS>