Progressive RPE thinning and attenuation develops in various clinical stages throughout the fundus. A tessellated appearance corresponding to irregular distribution of RPE atrophy and variable light reflection may be appreciated even in young patients with high myopia.

2010年3月1日 · The tessellated or tigroid pattern of the fundus resulted from visualization of the larger choroidal vessels located within the deep choroid. This appearance may be related to the overall loss of choroidal melanocytes secondary to choroidal atrophy seen in these patients.

Affected females have high myopia with a tigroid fundus and temporal crescent of the optic nerve. The eyes have an axial length of greater than 26 mm and a spherical refraction of -6 diopters or greater which are present before the age of 7 years.

In degenerative myopia, a tessellated (or tigroid) fundus appears due to thinning of the retinal pigment epithelium (RPE), which reveals the underlying choroidal vasculature as a mosaic pattern. Red channel imaging enhances the contrast of this pattern, providing clear visualization of these structural changes.

Tessellated (or Tigroid) Fundus (Category 1) Tessellated fundus is defined by the increased visibility of large choroid vessels owing to axial elongation ( Fig. 9 ). Tessellation begins to develop around the optic disc, especially in the area between the optic disc and the central fovea.

Due to the generalized depigmentation, the entire fundus appears tessellated (tigroid appearance). The areas of generalized atrophy do not have well-defined margins (white asterix). Additional focal areas of atrophy with well-defined margins are also evident (black arrows)

Progressive chorioretinal stretching results in characteristic fundus findings : Optic disc crescent, area of depigmentation due to dragging of the choroids and RPE from the optic nerve; Ruptures of Bruch's membrane (lacquer crack) Focal areas of chorioretinal atrophy