What is the primary purpose of performing an 'H' assessment in eye examination?

The primary purpose of performing an 'H' assessment during an eye examination is to assess extraocular movements. This technique involves the examiner guiding the patient's eyes through the shape of the letter 'H,' which allows for a thorough evaluation of the six extraocular muscles responsible for eye movement.

By directing the patient's gaze in different directions—left, right, up, and down—clinicians can observe the coordination and strength of the muscles controlling eye movement, as well as the function of the cranial nerves that innervate them. Any restriction or disparity in movement may indicate dysfunction related to these muscles or nerves, contributing vital information for diagnosing conditions such as strabismus, cranial nerve palsies, or other ocular disorders.

While evaluating visual acuity, checking for nystagmus, and measuring pupillary response are all important components of a complete eye exam, they serve different purposes and do not specifically relate to assessing extraocular movement as the 'H' assessment does.