Issue Details

ONE LIMITATION OF THE OPTICAL BIOMETRY TECHNIQUE IS THE SUBSTANTIAL ATTENUATION OF LIGHT CAUSED BY OPAQUE OCULAR MEDIA

ABSTRACT

Pathologies of the cornea and tear film may impede optical biometry measurement by causing fixation issues. In conclusion, the postoperative refractive result following cataract surgery is similar for both the A-Scan and the Optical Coherence methods. Measurement of axial length with a one-dimensional A-scan ultrasound is highly variable and may significantly affect the result. Although the patient was not required to focus or look in a certain direction, the measurement might not accurately reflect the distance to the fovea if the patient was not properly positioned. That was a serious issue. Regarding progress, the machine’s effectiveness needs to be enhanced to better penetrate ultrasonic waves in Applanation Biometry or light waves in Optical Coherence Biometry. Even though there are a number of machine updates and new technologies available, the problem is still quite serious technically. The machine’s operation is another crucial component. Both the patient’s cooperation and the machine operator’s understanding of this are crucial to the process. When using Applanation Biometry, it is crucial to indent the cornea and place the transponder on the corneal dome. If done incorrectly, this might result in an inaccurate assessment of the axial length, which ultimately impacts the surgical outcome for refractive error. Similarly, no additional machine operating expertise is needed for Optical Coherence Biometry; however, the light in the observation room and the density of cataracts impact the outcome. It is important to select the options for the IOL Power calculation formula provided by this machine based on the surgeon’s preference and the criterion for axial length.

FULL TEXT