By adapting the technique used for perilimbal suction cup analysis, a simple method of suction ophthalmodynamometry has been devised. The advantages of this technique are the elimination of orbital compression and erroneous vectors of force as well as greater ease of observation.
Galin MA, Baras I, Cavero R. Ophthalmodynamometry Using Suction. Arch Ophthalmol. 1969;81(4):494–500. doi:10.1001/archopht.1969.00990010496006