An eyeball protruding 3mm more than the orbit is generally abnormal, but the specifics have to do with the accuracy of the measurement.
Normally the eyeball is protruding more than the orbit, and under normal circumstances the protrusion should be about 12mm to 14mm. However, if the measurement method is inaccurate, the resulting value of protrusion is meaningless. If the current measurement method is accurate, an eyeball protrusion of 3mm is not normal and indicates that the patient has a sunken eye.
Measurement of eye protrusion requires the use of a specialized ocular protrudometer. Since the orbital rim is not a flat surface, the distance that the apex of the cornea of the eye protrudes from the lateral orbital rim is usually used as the criterion for calculating the degree of eye protrusion.
It is recommended that patients with abnormal eye protrusion values should consult a regular hospital in a timely manner to evaluate their condition and follow the doctor’s instructions for treatment.