choroidal thickness
Measurement of the choroidal layer, relevant in retinal disease assessment and surgical planning.
Full Definition
Choroidal thickness refers to the measurement of the choroidal layer, the vascular layer beneath the retina responsible for supplying nutrients to the outer retinal layers. This measurement has become increasingly important with advanced imaging techniques like enhanced depth imaging OCT. Choroidal thickness varies with age, refractive error, and various disease states including central serous chorioretinopathy, age-related macular degeneration, and inflammatory conditions. Normal choroidal thickness typically ranges from 200-400 micrometers subfoveally, with significant individual and diurnal variation.
Usage
Usage note: Increasingly important parameter in modern retinal disease diagnosis.
In Context
- "OCT revealed increased choroidal thickness consistent with central serous chorioretinopathy." — Retinal consultation
- "Choroidal thickness measurements were obtained using enhanced depth imaging protocols." — Imaging report