Certified Diagnostic Ophthalmic Sonographer (CDOS) Practice Exam 2026 – Your All-in-One Resource for Exam Success!

Immersion biometry is a method used for measuring the eye’s dimensions, particularly the axial length, which is essential for effective intraocular lens power calculation in cataract surgery. One significant advantage of immersion biometry is that it avoids corneal compression. This is because the technique involves immersing the eye in a solution, which reduces the effect of force applied to the cornea that occurs during other measurement techniques, such as contact biometry.

When the cornea is compressed, it can lead to inaccurate measurements, affecting the calculation of the necessary lens power. Since immersion biometry does not apply direct pressure on the cornea, it provides more reliable and consistent measurements. This method is particularly beneficial for patients with certain conditions where corneal shape or integrity might be compromised, ensuring that the measurements taken reflect the true anatomy of the eye rather than distortions caused by compression.

While factors like speed of measurement and technician training can be relevant, the key benefit of avoiding corneal compression directly enhances the accuracy of biometry results and ultimately contributes to better surgical outcomes.