Biomedical Engineering Reference
In-Depth Information
6
5
temporal
nasal
4
convergent
divergent
3
2
1
Relative vergence [
D
]
0
−
15
−
10
−
5
0
5
10
15
20
25
Fig. 22
Dependence of dichoptic masking on forced unadaptable relative vergence (average from
four subjects)
Dichoptic masking could be used for measuring the robustness (strength) of the
fusion mechanism. It is likely a part of the fusion mechanism, it processes dichoptic
visual inputs in parallel and the threshold value of masking is easily detected.
This study also proved that there is good agreement between threshold values for
experimental masking under unburdened conditions (zero vergence burdens under
natural conditions) with the empirical experience when using the fusion cover test
(FCT) in healthy children.
3
Conclusions
Correct anatomical and physiological functions are basic for a human binocular
vision. In case of any obstruction in these functions isn't possible the development of
the simple binocular vision. Described methods for measuring of the eye ver-gence
and accommodation and eye movements during image observation was developed to
improve care about the eyesight and measure theoretical hypothesis of physiological
and biomechanical processes of vision perception.
Content of observed scene (image activity) has also significant influence to whole
vision process and its features. These parameters aren't measured in general practice
but could be applied in diagnostics of functional vision disorders.
Application of videometric systems provides non-invasive simplicity and quick-
ness of measuring.
