Presbyopia correction and the accommodation in reserve

One method of determining the additional correction for presbyopia suggests leaving a percentage of the amplitude of accommodation in reserve. The rationale for this assumption seems logical because using all of the available accommodation is not sustainable without discomfort. However there is no empirical evidence indicating what percentage of the amplitude of accommodation should actually be left in reserve. Common figures adopted have been one‐half and one‐third. In this investigation the percentage of accommodation used is deduced mathematically after having determined the following:

[1]  H. Meltzer.  Textbook of Refraction. , 1954 .

[2]  R C Fitch.  PROCEDURAL EFFECTS ON THE MANIFEST HUMAN AMPLITUDE OF ACCOMMODATION* , 1971, American journal of optometry and archives of American Academy of Optometry.

[3]  E MARG,et al.  The amplitude of accommodation in presbyopia. , 1956, American journal of optometry and archives of American Academy of Optometry.

[4]  G. Shigezawa,et al.  A critical view of presbyopic add determination. , 1987, Journal of the American Optometric Association.

[5]  N. Mcbrien,et al.  Amplitude of accommodation and refractive error. , 1986, Investigative ophthalmology & visual science.

[6]  Ronald B. Rabbetts,et al.  Clinical Visual Optics , 1984 .

[7]  Hofstetter Hw.  A survey of practices in prescribing presbyopic adds. , 1949 .

[8]  T. Grosvenor,et al.  Primary Care Optometry , 1988 .

[9]  Hofstetter Hw.  A LONGITUDINAL STUDY OF AMPLITUDE CHANGES IN PRESBYOPIA. , 1965 .

[10]  H. Fledelius.  Accommodation and Juvenile Myopia , 1981 .

[11]  H. W. Hofstetter.  A LONGITUDINAL STUDY OF AMPLITUDE CHANGES IN PRESBYOPIA. , 1965, American journal of optometry and archives of American Academy of Optometry.

[12]  R. Bannon.  Physiological factors in multifocal corrections. I. Measurement of ocular functions. , 1955, American journal of optometry and archives of American Academy of Optometry.

[13]  Richard Davis,et al.  Duke-Elder's Practice of refraction , 1978 .