What parameter is most commonly measured during immersion biometry?

The axial length of the eye is the most commonly measured parameter during immersion biometry. This technique involves using ultrasound to accurately determine the distance from the anterior surface of the cornea to the retina, which is vital for calculating appropriate intraocular lens power for cataract surgery.

Measuring axial length is crucial because it directly impacts the overall refractive outcome after surgery. By knowing the axial length, ophthalmologists can select the correct lens implant to achieve optimal visual results for the patient. Immersion biometry is particularly valuable because it provides precise and reliable measurements, minimizing errors that could arise from external factors, such as corneal distortion or variations in measurement techniques associated with other parameters.

In this context, the other parameters mentioned, such as intraocular pressure, corneal curvature, and retinal thickness, may be important in their own right, but they do not represent the primary focus of immersion biometry, which is specifically centered on obtaining accurate measurements of axial length.