Thus, OCTA currently only allows the differentiation of tumors through their remote indirect effects in the macular region [36, 37, 60]. Third, there is currently no normative databases for OCTA-acquired FAZ, CVD, and FD measurements. Consequently, most OCTA studies described here report changes relative to fellow eyes [34–37, 40, 59]. There are also variations in measurement of CVD and FD, with the majority of techniques requiring extraction of OCTA images, not raw data, from each machine and post-acquisition image processing with third-party software subject to errors and inconsistencies [38–40, 53, 56, 57]. Furthermore, among currently available OCTA machines, only the Optovue Avanti has proprietary, investigational software to automatically quantify FAZ and CVD using raw data, and even so, values cannot be compared outside the same machine [80]. Even with the above limitations, continued evolution in OCT technology in the form of swept-source OCT may have potential in greater scan depth, faster scans with fewer artifacts, a wider field of view, and improved analysis of OCTA metrics [79, 81, 82]. Also, software upgrades revealing new image capture algorithms and image averaging in OCTA may also result in better quality from less noise and less discontinuous vessel segments [83, 84]. Finally, as OCTA gains momentum as an indispensable imaging modality, the eventual generation of a normative database may not be far-fetched.
In conclusion, OCTA provides additional features that can help differentiate between choroidal melanomas and pseudomelanomas. However, its role in ocular oncology is probably more suited for the early recognition and management of radiation retinopathy. OCTA is not a means to replace IVFA but rather should be used in conjunction, as it provides a fast, efficient, non-invasive, and dyeless method for the visualization of retinal microvasculature, without the ability for a wide scan depth or demonstrating leakage.
Conflict of Interest Statement
The authors (E.A.S., C.L.S.) have no financial disclosures.
Funding Sources
Support was provided by the Eye Tumor Research Foundation, Philadelphia, PA, USA (to C.L.S.).
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