Search results
Results from the WOW.Com Content Network
Exophoria. Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward. [1] During examination, when the eyes are dissociated, the visual axes will appear to diverge away from one another. [2] The axis deviation in exophoria is usually mild compared with that of exotropia.
The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
measuring strabismus. The prism cover test (PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
Prism (geometry) In geometry, a prism is a polyhedron comprising an n-sided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases.
Primula vulgaris is a perennial growing 10–30 centimetres (4–12 inches) tall, with a basal rosette of leaves which are more-or-less evergreen in favoured habitats. The leaves are 5–25 cm (2–10 in) long and 2–6 cm (1– in) broad, often heavily wrinkled, with an irregularly crenate to dentate margin. The leaf blade is gradually ...
Leaf whorls on a woody tree, Brabejum stellatifolium. In botany, a whorl or verticil is a whorled arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. [1][2] A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
The hypanthium with sepal lobes and stamens still attached develops to form the outer layer of the fruit. In angiosperms, a hypanthium or floral cup[ 1 ][ 2 ][ 3 ] is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube ...