What is immersion biometry primarily used for?

Immersion biometry is primarily used for determining the correct intraocular lens (IOL) power for cataract surgery. This technique involves immersing the eye in a fluid medium, which allows for more accurate measurements of the eye's dimensions compared to traditional methods. By providing a clearer view of the eye's anatomy and reducing the impact of corneal curvature and irregularities, immersion biometry enhances the precision with which the axial length of the eye is measured. This is critical for calculating the appropriate lens power needed to correct the patient’s vision post-surgery, ensuring optimal outcomes for cataract patients.

While other options such as measuring intraocular pressure, measuring peripheral vision, and calculating corneal thickness are also vital components of ophthalmic assessments, they do not typically involve immersion biometry or directly relate to the process of selecting IOL power.