The present invention relates to a tonometer planarization comprising respective means (18, 26) for transmitting a measuring beam through an applanation element (44) placed in the eye of a subject and to detect clarification reflected by this, said clarification is a measurement of the degree of flatness obtained by a contact surface (46) of said element. The data relating to the flattening force and reflected clarification are collected while the flattening force progressively increases until the contact surface of the applanation element is fully applied over the eye. the flattening force corresponding to a smaller area for interpolating the data collected predetermined contact, allowing a more accurate reading is derived. Means can afford to compensate the dynamic forces involved at the time of flattening of the smallest predetermined area. A device which controls the alignment of the tonometer with respect to the eye uses a source (24) monitoring light from which the clarification is directed along trajectories conjugate to form on the retina a bright motif depends on the alignment of tonometer the eye.
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