Glaucoma Screening Test by Segmentation of Optical Disc & Cup Using MATLAB

1. Glaucoma Screening Test by
Segmentation of Optical Disc &
Cup Using MATLAB
Showcased by: Hussain S

2. AGENDA
1.What is Glaucoma & it’s
screening test?
2.What is meant by Optical
disc and Cup?
3.Why segmentation is
necessary?
4.Architectural Design of
System
5.Conclusion

3. What is meant by
Glaucoma?
• Glaucoma is a general term used to
describe a group of eye disorders
that damage your optic nerve.
• It’s the most common form of optic
nerve damage leading to vision loss.
• The name of this pressure is
intraocular pressure (IOP), or eye
pressure.

4. 4
Types of
Glaucoma

5. What is meant by Optical
Cup & Disc?
• Optic cup is the bright central part of the
optic disc and which is an essential
parameter for detecting glaucoma.
• Compared to the optic disc, the optic cup
is smaller in size.
• Glaucoma usually presents as optic disc
cupping without pallor.
• This can help differentiate glaucoma
from other ophthalmic pathologies that
can change the color of the optic nerve.
• A normal optic disc has a pink-orange
appearance with a pale center where the
optic cup is.

6. Glaucoma Screening Test
• Glaucoma tests can determine
whether the optic nerve is
damaged, which may cause
vision problems.
• An ophthalmologist may
recommend a combination of
quick, painless procedures.
• Tests include angle test, corneal
thickness test, dilated eye exam,
eye pressure check, optic nerve
imaging and visual field testing.
6

7. 7

8. 8
Image
Acquisition
Image
Preprocessing
Optic Disc using disc
Photography (DP) and
Optical Coherence
Tomography(OCT).
K-means/Gabor
Filter/ONH &
RNHL
Segmentation.
Morphological
Features:
1)Erode,
2)Dilate.
Optic Cup
Segmentation :
Using
Binarization.
Cup-to-Disc
ratio(CDR
Calculation)
Glaucoma
Diagnosis.
Architectural
Design of
System.

9. Architectural Design of System:
o Image Acquisition: It can be broadly defined as action of retrieving from source.
o Image Preprocessing: It mainly focuses on noise remioval process .Such as image filteration,
color contrast enhancement.
o Optic Disc Segmentation: Using Disc Tomography (DT) and Optical Coherence Tomography(OCT)
o K-means Clustering: It is unsupervised clustering algorithm input data points into multiple class,
inherent distance.
o Gabour Filter: Used to accurate the image boundary.
o ONH and RNFL segmentation:Dividing and analyzing specific layers or regions of the optic nerve
head (ONH) and retinal nerve fiber layer (RNFL).
o Morphological Features: For description of shape of Object/ Regions. There are two operations
performed, Erosion and Dilation.
o Optic Cup Segmentation: Using Binarization.
o Cup-to-Disc ratio(CDR Calculation): If CDR value grater than threshold, then it is glaucomatous,
otherwise Healthy eye.
o Glaucoma Diagnosis: Through Medical Image acquisition, we can detect the Glaucoma of the
human eye.
9

10. 10
Conclusion
From Glaucoma,screening test of
Optic Disc and Cup using Image
processing technique (MATLAB) for
diagnosis is done.
Through Cup-to-disc calculation/ratio
(CDR): Distance of optic cup is
measured, from which types of
glaucoma can be detected (as given
in image) and accordingly further
diagnosis is done.

11. Thank
you