7.3 Ocular Coherence Tomography

Summary

Optical coherence tomography (OCT) is a noninvasive imaging technique that provides in situ, real-time cross-sectional images analogous to histologic slices through retinal tissue. The introduction of OCT to ophthalmology revolutionized the management of DME, providing objective documentation of retinal thickening and cystic structures that are invisible on clinical examination. Spectral-domain OCT (SD-OCT) improved on the original technology of time-domain OCT, introducing faster scanning times and higher resolution and allowing the creation of 3-dimensional images of retinal tissue.

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Quiz Module 7.3

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1. A principal value of OCT imaging for DME lies in its

a. Ability to provide information on retinal blood flow.

b. Precise measurement of intraocular pressure.

c. Objective documentation of retinal thickening and cystic structures that are invisible on clinical examination.

d. Relative low cost in comparison with other imaging methods.

2. Which of the following is NOT true of OCT?

a. OCT is less sensitive than other imaging methods to early changes in DME.

b. SD-OCT can demonstrate small cysts even when retinal thickening is moderate.

c. OCT imaging can document accumulation of fluid in and under the retina.

d. OCT imaging can help the clinician to distinguish morphologic features of DME such as diffuse retinal thickening, cystoid macular edema, or serous DME.

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7.3 Ocular Coherence Tomography

Summary

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Quiz Module 7.3