A 28-year-old software engineer with high myopia (−12.5 D, axial length 29.8 mm) presents with one week of central metamorphopsia and a dark spot in the left eye. Best-corrected visual acuity is 6/24 OD. Dilated fundus examination reveals a tessellated fundus, peripapillary crescent, and irregular yellowish linear breaks radiating from the fovea. The structure marked **A** in the diagram represents these linear breaks. Histologically, what do these breaks represent?