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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]
A peak or projection from the top of a hill or mountain, or any rounded protrusion of land, especially a small but prominent or isolated hill with steep sides; a boulder or an area of resistant rock protruding from the side of a hill or mountain. The term is used primarily in the southern United States. [5] knoll.
The Dictionary of Greek and Roman Biography and Mythology is a biographical dictionary of classical antiquity, edited by William Smith and originally published in London by Taylor, Walton (and Maberly) and John Murray from 1844 to 1849 in three volumes of more than 3,700 pages. It is a classic work of 19th-century lexicography.
Treatment options for esotropia include glasses to correct refractive errors (see accommodative esotropia below), the use of prisms, orthoptic exercises, or eye muscle surgery. The term is from Greek eso meaning "inward" and trope meaning "a turning".
N. nadir. narrows. Also narrow. A land or water passage that is confined or restricted by its narrow breadth, often a strait or a water gap. nation. A stable community of people formed on the basis of a common geographic territory, language, economy, ethnicity, or psychological make-up as manifested in a common culture. national mapping agency.
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
Merriam-Webster's Geographical Dictionary ( Webster's Geographical Dictionary, Webster's New Geographical Dictionary) is a gazetteer by the publisher Merriam-Webster. The latest edition was released in 2001, edited by Daniel J. Hopkins and contained over 54,000 entries. The first edition was published in 1949 and the second edition in 1972.
9783375174040. The Dictionary of Greek and Roman Geography is the last in a series of classical dictionaries edited by the English scholar William Smith (1813–1893), following A Dictionary of Greek and Roman Antiquities and the Dictionary of Greek and Roman Biography and Mythology. It was first published in 1854, and last reissued in 2005.
Convergence insufficiency. Convergence Insufficiency. Other names. Convergence disorder. Specialty. Ophthalmology, optometry. Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence .
Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition . [2] [3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...