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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.
C-flat major is the home key of the harp, with all its pedals in the top position, and it is considered the most resonant key for the instrument.Thus, in Richard Strauss's Ein Heldenleben, the first cue for the harps is written in C-flat major even though the rest of the orchestra, having previously played in E-flat major, retains a 3-flat key signature and is now playing in B major, marked ...
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]
The Sonata in C major for piano four-hands, K. 521, is a piano sonata in three movements composed by Wolfgang Amadeus Mozart in 1787. It was his last complete piano duet sonata for one piano, four hands. [1] This sonata consists of three movements: Allegro, Andante and Allegretto.
Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
The Notturno in E-flat major, Op. 148 (D. 897), also called Adagio, is a nocturne for piano trio by Franz Schubert. Description [ edit ] This substantial but relatively neglected piece has affinities with the slow movements of both the String Quintet in C major D. 956 , and the Piano Trio No. 1 in B-flat , D 898.
The Piano Sonata in C-sharp minor, Op. posth. 80, was written by Russian composer Pyotr Ilyich Tchaikovsky in 1865, his last year as a student at the St Petersburg Conservatory. The sonata in its original form was not published in Tchaikovsky's lifetime; it was published in 1900 by P. Jurgenson , and given the posthumous opus number 80.
Geistervariationen. The Geistervariationen ( Ghost Variations ), or Theme and Variations in E-flat major for piano, WoO 24, composed in 1854, is the last piano work of Robert Schumann. The variations were composed in the time leading up to his admission to an asylum for the insane and are infrequently played or recorded today.
Étude Op. 25, No. 1 in A-flat major is a solo piano work composed by Frédéric Chopin in 1836, and published in 1837. The work consists entirely of rapid arpeggios and harmonic modulations based on A-flat major . Robert Schumann praised this work in a dissertation on the Études; calling it "a poem rather than a study", he coined for it the ...
The Nocturne No. 20 in C♯ minor, Op. posth., Lento con gran espressione, P 1, No. 16, KKIVa/16, WN 37, is a solo piano piece composed by Frédéric Chopin in 1830 and published in 1875. Chopin dedicated this work to his older sister Ludwika Chopin, with the statement: "To my sister Ludwika as an exercise before beginning the study of my ...