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OCT (Optic Coherence Tomography) 1)Noninvasive 2) non-contact imaging 3)Millimeter penetration

OCT (Optic Coherence Tomography) 1)Noninvasive 2) non-contact imaging 3)Millimeter penetration Aproximately 2-3 mm in tissue with micrometer scale (axial and transverse resolution) not only the retina and optic nerve but also anterior segment of the eye.

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OCT (Optic Coherence Tomography) 1)Noninvasive 2) non-contact imaging 3)Millimeter penetration

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  1. OCT (Optic Coherence Tomography) 1)Noninvasive 2) non-contact imaging 3)Millimeter penetration Aproximately 2-3 mm in tissue with micrometer scale (axial and transverse resolution) not only the retina and optic nervebut also anteriorsegment of the eye

  2. 4) Ist demonstrated in 1991 (20 years ago) 5) Today we have the conventional OCT with an axial resolution of < 10µm and 3Dimentional (3D) OCT with a much higher resolution of 5µm

  3. OCT principle Is similar to ultrasound Uses echoes to locate structures within the body

  4. Light speed and sound The speed of light being almost a million times faster than sound allows measurement of structures with a resolution of < 10 microns compared to 100 microns scale for ultrasound.

  5. OCT Can clearly image the cornea, sclera, iris and lens in the anterior segment. using infrared light having a wave length of 13.1 nm

  6. Radial line OCT compared to 3D- OCT In contrast to radial – line ,3D- OCT captures a dense , uniform grid of data that is unlikely to miss small , focal lesions.

  7. Role of OCT imaging OCT is useful in the diagnosis and staging of diseases which help in their management , assessing the response to treatment and in monitoring the progress of the disease.

  8. Resolution power Current commercial OCT scanners offer a resolution of 8-10 micron that is at least 10 time better than ultrasound

  9. OCT Colors Tissues with higher reflectivity such as RPE appear in brighter colors ( red-white)– and less dense structures , such as vitreous and intraretinal fluid , appear in darker colors. (blue- black )

  10. Retinal thickness Macular thickness with Topcon 3D –OCT ( Indian eyes ) Foveael thickness 154-282 micron Other parts 210 -311 micron

  11. CSR Men 6-10 times more often than it affects women. After 50 years usually its bilateral Age-20-55 years Leakage from choriocapillaries through the RPE

  12. 1- Central SerousChorioretinopathy

  13. First case of CSR

  14. 3 months after treatment

  15. CSR Case no 2

  16. CSRCase no 3

  17. 2 -ChoroidalColoboma

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