Download Table 1

Table 1 - Classification of angle closure glaucoma according to Ritch. The
four anatomic sites where aqueous flow obstruction may occur
Table 2 – Ultrasound Biomicroscopy (UBM) features of filtering blebs
according to Yamamoto. Filtering blebs with low internal tissue reflectivity
showed the best intraocular pressure control immediately followed by blebs
with high tissue reflectivity.
Table 3 - Characteristics of the filtering blebs according to Labbé et al. based
on Anterior Segment OCT (AS-OCT) imaging and correlation with in
vivo confocal microscopy. Diffuse and cystic blebs showed the best
intraocular pressure control.
Table 4 – Comparison of clinical advantages and disadvantages of
Ultrasound Bio-Microscopy (UBM) and Anterior Segment OCT (AS-OCT).
Table 1
Site of aqueous humor
obstruction
Angle closure glaucoma
Iris
Primary Pupil Block
Ciliary Body
Plateau Iris
Lens
Phacomorphic Glaucoma
Suprachoroidal Fluid
Uveal Effusion/ Malignant Glaucoma
Table 2
UBM
Low
reflectivity
High
reflectivity
Encapsulated
Flat
Internal
reflectivity
Reducedmoderate
High
High
High
Subscleral
route
Visible
Usually
visible
Visible
Absent
Cystic spaces
with fluid
Possible
Possible
Cavernous
Absent
Height
Moderatehigh
Variable
Variable
Flattened
Table 3
AS-OCT
Diffuse
Cystic
Encapsulated
Flattened
Suprascleral
Low
Low
High
High
Internal
Low
Cystic
Absent
High
reflectivity
Heterogeneous
spaces
Height
Variable
Variable
High
Flattened
Loose
Dense/fibrous
reflectivity
In vivo
Loose
connective
connective
Dense/fibrous
confocal
connective
tissue and
tissue over
connective
microscopy
tissue
fluid-filled
large gap
tissue
gaps
space
Table 4
UBM and AS-OCT
UBM
Performance
Advantages
-Both technologies
-Provides high-resolution
-Provides high-
provide evidence of
cross section images of
resolution cross
contributing
anterior segment and ACA
sectional images of
mechanisms and
including structures behind
anterior segment to
principal structures
the iris such as the ciliary
the iris-lens
causing angle-closure
body, zonule, pars plana,
diaphragm
glaucoma to decide best
anterior lens face, lens
-It is easy to operate
effective treatment
equator and anterior
-Does not require
-Characterize
vitreous
much collaboration
quantitatively anterior
-Enables visualization of
-Offers fast acquisition
segment using
morphology and topography
-Allows exact
measurement
changes of ACA structures
knowledge of image
parameters as valuable
associated with lighting
location
screening, diagnostic
conditions, drugs,
-Can be used in early
and treatment
diagnostic indentation and
post-operative period
assessment tools
age
and ocular trauma
-Illustrate how the ciliary
AS- OCT
Disadvantages
body/iris complex –
anterior chamber angle
-Requires immersion
-Does not provide
amplitude changes with
technique, although a saline
much detail of
age, accommodative
filled eye cap can be
structures posterior to
UBM and AS-OCT
UBM
AS- OCT
and light stimuli
adapted to the probe;
the iris
-Assess glaucoma
-May cause
filtering surgery

Discomfort
outcomes

Abrasion and infection

Potential anterior
segment deformation

Inadvertent indentation
-It is time-consuming
-Requires

Trained operator

Classically a more
supine position

Collaborative patient