As the ptosis worsens, the individual commonly extends their neck, elevating their chin in an attempt to prevent the eyelids from occluding the visual axis.
12.
The eye's tissues and structures that are in the visual axis ( and also the tissues adjacent to it ) affect the quality of the image.
13.
Negative chromostereopsis was further studied by Allen and Rubin who suggested that changing the angle between the pupillary center and visual axis can change the direction of chromostereopsis.
14.
This is because moving the pupil changes the position of the optic axis, but not the visual axis, thus changing the sign of transverse chromatic aberration.
15.
This principle calls for orienting attention toward historic monuments and heritage structures, leaving space at the ends of visual axis to frame " existing views and vistas.
16.
Another advantage of PCI over ultrasound biometry is that the axial length measurement is performed through the visual axis since the patient is asked to fixate into the laser spot.
17.
Chronically or the end result will cause blurring of vision secondary to corneal stromal scarring, presence of ghost vessel and thinning of the cornea especially if it involves the visual axis.
18.
In highly myopic or staphylomatous eyes, this can be particularly advantageous since it can sometimes be difficult to measure the true axial length through the visual axis with an ultrasound probe.
19.
Convergence of the eyes, or the orientation of the visual axis of each eye towards an object in order to focus its image on each fovea, is the first of the three responses.
20.
Orthoptists specialize in the diagnosis and management of problems with eye movement and coordination, such as misalignment of the visual axis, binocular vision problems, and pre / post surgical care of strabismus patients.
