What is one disadvantage of contact biometry?

Contact biometry involves placing a device directly onto the eye, often requiring the use of a probe that makes contact with the cornea. One significant disadvantage of this method is that it can cause corneal compression, which may lead to inaccuracies in the measurements obtained. When the cornea is compressed, its shape can change temporarily, distorting the actual dimensions that need to be measured for calculating parameters such as axial length, which is critical in determining appropriate lens power.

This compression effect can be particularly evident in eyes with a higher degree of myopia or in cases where corneal integrity is compromised. Such errors can result in inaccurate ocular measurements, ultimately affecting diagnostic outcomes and treatment plans. Thus, understanding the limitations of contact biometry is key for practitioners when choosing the appropriate method for obtaining ocular measurements.