2. 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

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

6. OCT principle 1) 1)Is similar to ultrasound 2) 2)Uses echoes to locate structures within the body

7. 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.

8. 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

9. 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.

10. 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.

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

13. 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 )

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

31. 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

32. 1- Central Serous Chorioretinopathy

33. First case of CSR

37.  3 months after treatment

38. CSR Case no 2

43. CSR Case no 3

47. 2 - Choroidal Coloboma

51. 3 - Degenerative Myopia

59. 4- Diabetic Macular Edema

60. Diabetic Macular Edema Case no 1

63. Cystoid Macular Edema Case no 2

66. CSME with Serous Retinal Detahment (Cystoid Macular Edema) Case no 3

69. CSME with Fovea Vitreal Traction

72. Intravitreal Triamcinolone Acetonide in Diabetic Macular Edema (4mg)

74. Pre-treatment

75. Post treatment (4mg Triamcinolone)

78. 5- Epiretinal Membranes

79. Case no 1

81. ضمن عرض پوزش بدلیل حجم بالای LECTUER ادامه اسلایدها امکان پذیر نمیباشد در صورت نیاز به ادامه لطفا به واحد سمعی و بصری مرکز آموزشی درمانی فیض مراجعه و یا با شماره تلفن 03114476010 داخلی 392 تماس حاصل نمائید با تشکر