[Latticed or dendritic lines on the periphery of the retina].

Latticed or dendritic lines (true white lines) on the periphery of the retina. Vitreo-retinal adherences between the ora and equator correspond to former embryonal blood vessels to the vitreous (or retinal vessels) attaching to the retina. Between attachments of vitreous consolidations coming from in front and behind as a congenital anomaly of the retina, the latter is either loosened or replaced by connective tissue, or there is a defect, wedge-shaped from within outwards (colobomatous). These are obviously very frequently comgenital. The vitreous between and above the vitreous-retinal attachments is always liquefied and structureless. With increasing age, there is a reactive proliferation of the connective tissue (vessel-vitreous medullary cells) and pigmented epithelium. This new tissue either replaces the retina or rests on it distinctly localized, and has a strong tendency to hyalinization and sclerosis (sclerotic degenerative area). The latticed or dendritic lines (true white lines) on the periphery of the retina which for preference appear in the region of the degenerative sclerotic area sometimes consist of obliterated vessels with hyalinized walls and sometimes of hyaline connective tissue threads which are independent of the vessels. Frequently the vitreous fibre strands (vitreo-retinal adherences) may also continue through the inner retinal layers as far as these dendritic hyaline (white) retinal threads of connective tissue.