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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Retina. 2010 Feb;30(2):235. doi: 10.1097/IAE.0b013e3181bd2c3b

Fig 5.

Fig 5

Demonstration of macular thickness segmentation algorithms in different instruments. All instruments define the inner boundary as the internal limiting membrane, but there is variation in outer boundaries. Stratus OCT measures to the IS/OS junction (a), Cirrus HD-OCT (b) and RTVue-100 (c) both measure close to the RPE, and the RTVue also draws a boundary at the inner plexiform layer. 3D OCT-1000 measures to the photoreceptor outer segment tips (d), shown as the third line from the top. This instrument also draws boundaries at the IS/OS junction (second line) and posterior RPE boundary (fourth line), which are not included in retinal thickness measurements.