**3. OCTA in myopic macular-related conditions**

Pathological/degenerative myopia is characterized by progressive anteroposterior elongation of the globe with resulting morphological, structural and functional consequences. Ocular pathologies associated with degenerative myopia include myopic traction maculopathy e.g. myopic retinoschisis, posterior staphyloma, parapapillary atrophy, and myopic choroidal neovascular membrane among others. Myopic CNVM has a poor prognosis for central vision preservation and is a major cause of visual morbidity in myopic patients. Since OCTA combines both high-resolution structural B-scans and angiography, it can be useful to demonstrate structural and morphological alterations of myopia like retinoschisis, parapapillary atrophy, dome-shaped macula as well as to detect the development of CNVM (**Figures 3** and **4**). However,

#### **Figure 3.**

*A myopic CNVM case: A branching tree with peripheral anastomoses and looping as well as dark halo around the edges conforming activity. The B-scan showed subretinal fluid accumulation denoting activity.*

#### **Figure 4.**

*End-stage myopic CNVM***;** *a dead tree configuration at the level of choriocapillaris with a lack of branching, anastomoses, and looping.*

*Role of OCT Angiography OCTA in the Diagnosis of Macular Diseases DOI: http://dx.doi.org/10.5772/intechopen.111673*

the anatomical derangement of the posterior segment in degenerative myopia can pose an obstacle to retrieving high-quality OCTA images with OCTA segmentation artifacts being very common in eyes with degenerative myopia. Therefore, myopic OCTA images have to be examined cautiously and frequently require manual segmentation by an expert to lessen the impact of segmentation artifacts [9, 10].
