Clinical Optics by Andrew R. Elkington, Helena J. Frank, Michael J. Greaney

By Andrew R. Elkington, Helena J. Frank, Michael J. Greaney

Written to aid trainee ophthalmologists, this textbook is now the recognized textual content on optics for the examinations of the Royal university of Ophthalmologists and the Royal Surgical faculties. It techniques the topic from first rules and assumes no past wisdom of optics. The publication has been saved so simple as attainable and is liberally complemented with diagrams designed to be simply understood and memorised. basically the main basic and clinically necessary mathematical formulae are quoted, and the optical ideas are utilized to scientific events. Ophthalmology examinations have replaced considerably because the final variation used to be written and a complete rewrite of this crucial consultant has develop into invaluable. The 3rd version has been made extra finished and targeted to take care of with those adjustments and contains 3 new chapters: refractive surgical procedure, touch lenses and lasers. different new fabric contains photometry, visible acuity, distinction sensitivity, color imaginative and prescient, absorptive lenses, fluorescence, ultrasound, and the specular microscope.

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Sample text

G. prism bars. If a high-power prism is not used in the correct position, a considerable error will result. In practice, plastic prisms may be held in the frontal plane as this is near enough to the position of minimum deviation to avoid significant inaccuracy. For example, a 40 dioptre plastic prism held in the frontal plane will have an effective power of 41 dioptres, but if it is held in the Prentice position its effective power becomes 72 dioptres. Furthermore, it is not satisfactory to stack prisms one on top of another, because the light entering the second and subsequent prisms will not be at the correct angle of incidence.

1) Assessment of squint and heterophoria. (a) Measurement of angle objectively by prism cover test. (b) Measurement of angle subjectively by Maddox rod. (c) To assess likelihood of diplopia after proposed squint surgery in adults. (d) Measurement of fusional reserve. Increasingly powerful prisms are placed before one eye until fusion breaks down. This is very useful in assessing the presence of binocular single vision in children under 2 years of age. (e) The four-dioptre prism test. This is a delicate test for small degrees of esotropia (microtropia).

Prism bars. If a high-power prism is not used in the correct position, a considerable error will result. In practice, plastic prisms may be held in the frontal plane as this is near enough to the position of minimum deviation to avoid significant inaccuracy. For example, a 40 dioptre plastic prism held in the frontal plane will have an effective power of 41 dioptres, but if it is held in the Prentice position its effective power becomes 72 dioptres. Furthermore, it is not satisfactory to stack prisms one on top of another, because the light entering the second and subsequent prisms will not be at the correct angle of incidence.

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