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The only [verification needed] ambiguity with this unique systemized method is on the urinary bladder meridian, where the outer line of 14 points found on the back near the spine are inserted in one of two ways; following the last point of the inner line along the spine (會陽) and resuming with the point found in the crease of the buttocks ...
The meridian of the visual field has been found to influence the folding of the cerebral cortex. In both the V1 and V2 areas of macaques and humans the vertical meridian of their visual field tends to be represented on the cerebral cortex's convex gyri folds whereas the horizontal meridian is tends to be represented in their concave sulci folds ...
The binocular visual field is the superimposition of the two monocular fields. In the binocular field, the area left of the vertical meridian is referred to as the left visual field (which is located temporally for the left, and nasally for the right eye); a corresponding definition holds for the right visual field.
(The steepest and flattest meridians of the eye are called principal meridians.) With-the-rule astigmatism – the vertical meridian is steepest (a rugby ball or American football lying on its side). [17] Against-the-rule astigmatism – the horizontal meridian is steepest (a rugby ball or American football standing on its end). [17]
The pattern deviation probability plot (or total deviation probability plot when MD is worse than -20 dB) is used to identify abnormal points and age corrected sensitivity at each point is calculated using total deviation numerical map. VFI is a reliable index on which glaucomatous visual field severity staging can be based. [22]
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A Snellen chart or other eye chart may initially reveal reduced visual acuity. A keratometer may be used to measure the curvature of the steepest and flattest meridians in the cornea's front surface. [14] Corneal topography may also be used to obtain a more accurate representation of the cornea's shape. [15]
In visual perception, the far point is the farthest point at which an object can be placed (along the optical axis of the eye) for its image to be focused on the retina within the eye's accommodation. It is sometimes described as the farthest point from the eye at which images are clear. The other limit of eye's accommodation is the near point.