An ophthalmic apparatus (102) comprising: a casing defining a cassette receptacle (138)； a sensor arrangement in communication with the cassette receptacle (138)； and a cassette (104) configured to operatively engage the cassette receptacle (138) to establish operational communication between the cassette (104) and the sensor arrangement (126), the cassette (104) comprising: a body (108) of the cassette configured to fit with the cassette receptacle (138), wherein the cassette body (108) defines a storage receptacle (112/114)； a manifold (124) defining an inlet port (180) in fluid flow communication with a fluid passageway (120/122)； and a storage chamber (116/118) in selective fluid flow communication with the fluid passageway (120/122) when the storage chamber (116/118) is engaged with the storage receptacle (112/114). cassette body storage (108)； characterized in that the sensor arrangement (126) is operatively associated with the cassette (104) fitted with the cassette receptacle (138) to transmit a detection signal (129/131) to detect: a first state in which the camera ( 116/118) is separate from the storage receptacle (112/114), a second state in which the storage chamber (116/118) is attached to the storage receptacle (112/114) and the arrangement (126) sensor detects only air in the storage chamber (116/118), and a third state in which a liquid fills the storage chamber (116/118) attached to the storage receptacle (112/114) above a level predetermined.Un aparato (102) oftálmico que comprende: una carcasa que define un receptáculo (138) del casete； una disposición de sensor en comunicación con el receptáculo (138) del casete； y un casete (104) configurado para encajar operativamente con el receptáculo (138) del casete para establecer una comunicación operativa entre el casete (104) y la disposición (126) de sensor, comprendiendo el casete (104): un cuerpo (108) del casete configurado para encajar con el receptáculo (138) del casete, en el que el cuerpo (108)
