In visual acuity with refractive error can be attributed to depth Smallest error as a decrease in visual acuity or contrast, whereas othersĪre happy with 2.00 or 3.00 diopters (D) of blur. REFRACTIVE ERROR, VISUAL ACUITY, AND CONTRASTĬlinical experience demonstrates that patients have a wide range of reactions Materials, and with the development of aspheric lens designs that canīe used for essentially any lens power, lens design has become more important With the increased use of high-index, lightweight lens ![]() Of objects from the patient, and the need to maintain normal binocular ![]() Surface power or base curve of the lens, taking into account such variablesĪs the vertex distance or fitting distance of the lenses, the distance This involves the proper choice of the front In a spectacle prescription that occur when a patient looks away from Purpose of the spectacle lens design process is to minimize the errors Optical quality and decrease the field of clear vision. ![]() Optical effects (aberrations) are present that limit off-axis The patient moves his or her eyes to look away from the lens center, undesirable Spectacle Lens Design Chapter 51BĪ spectacle lens only corrects a patient's refractive error at itsĬenter that is, when the patient is looking along the optic axis.
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