Which of the following describes the technique of immersion biometry?

The technique of immersion biometry is accurately described by the option that states it avoids corneal compression by using a fluid-filled shell. This method involves the immersion of the eye in a fluid, which serves several purposes, including providing a stable medium for accurate measurements without exerting pressure on the cornea. This is particularly important because corneal compression can alter the shape of the eye and affect measurement accuracy, especially when assessing parameters needed for intraocular lens (IOL) calculations prior to cataract surgery.

In immersion biometry, a fluid-filled shell or immersion fluid is used to neutralize the effects of the air-to-tissue interface, allowing for a more direct measurement of the eye's dimensions. This technique is particularly beneficial for evaluating patients with irregular corneas or those who may experience discomfort in traditional methods that require contact with the eye. Thus, the use of a fluid-filled shell is integral to achieving accurate biometry measurements while maintaining the health and comfort of the patient's eye.