CPT® Code 0330T

The ocular tear film is a crucial component of eye health, consisting of three distinct layers: a lipid outer layer that minimizes tear evaporation, an aqueous middle layer that provides moisture, and a mucus inner layer that helps adhere the tear film to the corneal epithelium. Tear film imaging is a diagnostic procedure designed to evaluate the tear film's characteristics by quantifying its height, assessing its stability, and identifying any dry spots that may be present. This imaging can be performed unilaterally (on one eye) or bilaterally (on both eyes) and is essential for diagnosing conditions related to dry eye syndrome and other ocular surface disorders. The procedure employs advanced technologies such as optical coherence tomography (OCT) and ellipsometry. OCT utilizes light waves to create high-resolution, non-invasive images of the anterior segment of the eye, including the boundaries of the tear film. On the other hand, ellipsometry analyzes the polarization states of light to determine the thickness and refractive index of the lipid layer of the tear film. Often, these two methods are used in conjunction to provide a comprehensive evaluation of the tear film, which is vital for ensuring accurate refraction when fitting corrective lenses and achieving successful outcomes in cataract and refractive surgeries.