Axes And Angles Flashcards
The axis containing the centers of curvature of the eye’s optical surfaces.
Optical Axis
_________ axis is a straight line along which a ray both enters and exits the system. It is a line of rotational symmetry.
Optical
The line connecting the foveola and the fixation point passing through the nodal points.
Visual axis
The place of intersection of visual axis with the cornea is known as:
Ophthalmometric pole
The line normal to the cornea passing through the center of the pupil.
Pupillary axis
_______ _________ is an adaptation to heterotropia (squint or turned eye).
Eccentric fixation
Ray from fixation point that reaches the foveola via center of the pupil.
Line of Sight
The position at which the LoS intercepts the cornea is called the _______________.
Corneal Sighting Center
The line connecting the nodal point and the center of the pupil.
Achromatic Axis
The line passing through the fixation point and the center of rotation of the eye
Fixation Axis
The line passing through the fixation point and the center of curvature of anterior cornea
Keratometric Axis
The point at which the axis intercepts the cornea is sometimes called the _______________.
Vertex Normal
Due to the fiber optical characteristics of the retinal photoreceptor, light arriving at the retinal plane along the photoreceptor axis will be ________________ and have a higher probability of being absorbed by the photopigment. Therefore, humans are more sensitive to light passing through the section of the pupil that is coaxial with the receptor axis. Hence the pupil appears to be apodized.
Totally internally reflected
The eye’s optical image is sampled by the receptors and retina neurons. The sampling density, and hence spatial bandwidth of the neural image peaks at the foveola and declines monotonically with increasing eccentricity.
What axis is this?
Neural Axis
Angle between the optical and visual axis
Angle Alpha
