CPT® Code 0198T

The CPT® Code 0198T refers to a specialized procedure known as the measurement of ocular blood flow through repetitive intraocular pressure sampling, which includes the interpretation of the results and the generation of a report. This procedure utilizes a miniaturized sensor that is integrated into the tip of a tonometer, a device commonly used to measure intraocular pressure (IOP). The design of the tonometer tip is concave, allowing it to conform to the shape of the cornea when it is placed on the eye. As the tonometer tip is positioned on the cornea, the central cornea adapts to the curvature of the tip, enabling accurate pressure readings. The sensor embedded in the tonometer tip is capable of capturing up to 100 IOP readings every second, providing a detailed assessment of the intraocular pressure dynamics. The measurement of ocular blood flow is derived from the pulse wave generated by the device, which reflects the heart rate and the mean difference between diastolic and systolic IOP. This specific measurement is referred to as ocular pulse amplitude (OPA), which serves as a significant indicator of the quality of ocular blood flow. The procedure is particularly beneficial in the diagnosis of normal tension glaucoma, a condition where optic nerve damage occurs despite normal IOP levels. Overall, this advanced testing method offers valuable insights into ocular health and assists healthcare professionals in making informed clinical decisions.