Near-vision lens effects on nearwork-induced transient myopia

Abstract Nearwork-induced transient myopia (NITM), a lenticular-based pseudomyopia, is commonly found in myopic teenagers and young adults. It has been speculated that its presence may be a factor in nearwork-related symptoms and in the development of permanent myopia. Thus, the differential effect of various powered near-vision lenses on NITM was investigated. Nine young adults monocularly-viewed a near target (25 cm) for 20 min through either a +4, +2, or 0 diopter (D) near lens, or a 0.5-mm pinhole, over their habitual distance prescription. Monocular distance refraction was objectively assessed immediately before and after the near task. Decreasing the accommodative stimulus reduced the blur-driven adaptive aftereffect. Only with the 0 D accommodative stimulus condition was NITM not produced. These results suggest that the full blur-driven monocular stimulus to accommodation must be negated to prevent the occurrence of NITM. With the pinhole providing blur-free viewing conditions, a substantial proximal accommodative adaptive component was present.

[1]  G K Hung,et al.  Proximal contribution to a linear static model of accommodation and vergence. , 1996, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[2]  K J Ciuffreda,et al.  Contribution of accommodation and disparity‐vergence to transient nearwork‐induced myopic shifts , 1992, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[3]  J. Lebensohn.  The Causes and Prevention of Acquired Myopia , 1958 .

[4]  K. Ciuffreda,et al.  “Starkfest” Vision and Clinic Science Special Issue: Abnormal Transient Myopia in Symptomatic Individuals after Sustained Nearwork , 1995, Optometry and vision science : official publication of the American Academy of Optometry.

[5]  B. Gilmartin,et al.  Repeatability of post‐task regression of accommodation in emmetropia and late‐onset myopia , 1994, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[6]  K J Ciuffreda,et al.  Vision therapy to reduce abnormal nearwork-induced transient myopia. , 1998, Optometry and vision science : official publication of the American Academy of Optometry.

[7]  E. Goldschmidt.  [On the etiology of myopia. An epidemiological study]. , 1968, Acta ophthalmologica.

[8]  G. Hung,et al.  The linearity of proximally induced accommodation and vergence. , 1991, Investigative ophthalmology & visual science.

[9]  K. Ciuffreda,et al.  Accommodation, Nearwork and Myopia , 1997 .

[10]  M Millodot,et al.  Clinical evaluation of the Canon Autoref R-1. , 1985, American journal of optometry and physiological optics.

[11]  K J Ciuffreda,et al.  Proximally induced accommodation and accommodative adaptation. , 1990, Investigative ophthalmology & visual science.

[12]  K J Ciuffreda,et al.  Cognitive Demand and Transient Nearwork-lnduced Myopia , 1994, Optometry and vision science : official publication of the American Academy of Optometry.

[13]  B Gilmartin,et al.  Effect of target proximity on the open-loop accommodative response. , 1990, Optometry and vision science : official publication of the American Academy of Optometry.