*4.3.3.5. Optical coherence tomography*

3. Symptoms

*Melanoma*

4.Orange pigmentation

5.Margin <3 mm to disk

6.Ultrasound hollow

7.Absent halo

*4.3.3 Investigations*

8.Absent grusen

*4.3.3.1. Ultrasonography*

and to evaluate for extraocular extension. The characteristic features on A-scan are:

The characteristic features on B-scan are:

1.Low to medium internal reflectivity

3. Shadowing of subadjacent soft tissue

1. Initial prominent spike

2.Choroidal excavation

4. Internal vascularity

5.Acoustic hallowing

*4.3.3.3. Fundus fluorescein angiography*

*4.3.3.4. Ultrasound biomicroscopy*

internal tumor details is limited.

**42**

*4.3.3.2. Autofloroscence*

It has 95% accuracy and is useful to estimate tumor size for periodic observation

2.Low to medium internal reflectivity with diminishing amplitude

3.Fine oscillation of internal spiking pattern (vascular pulsations)

Hyperautofluorescence of orange-colored lipofuscin pigment.

Small melanoma: Hypofluorescence (blocked fluorescence)

followed by late intense staining. Double circulation—internal vascularity

It helps to differentiate anterior tumors from those of ciliary body origin. Although the tumor margins and extent is well delineated by UBM, the resolution of

Large melanoma: Patchy pattern of early hypofluorescence and hyperfluorescence

Dome-shaped choroidal mass with overlying outer retinal thickening and subretinal fluid.

Optical coherence tomography angiography shows reduced capillary density in the affected eye.
