Nearwork-induced transient myopia

Ong, Editha; Ciuffreda, Kenneth J.

doi:10.1007/bf01204624

Cited by 81 publications

(61 citation statements)

References 41 publications

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“…It reflects an inability of the crystalline lens to reduce its power appropriately and rapidly, thus reflecting an accommodative aftereffect/hysteresis phenomenon of presumed pharmacologic origin. 5,13 In the normal population, the mean magnitude of NITM is typically sufficiently small (approximately 0.3 D) and remains within the depth of focus of the eye, thus producing no perception of blur. 16,17 One of the first efforts to study NITM was by Lancaster and Williams.…”

mentioning

confidence: 99%

Additivity of Near Work–Induced Transient Myopia and Its Decay Characteristics in Different Refractive Groups

Vasudevan

Ciuffreda

2008

Invest. Ophthalmol. Vis. Sci.

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EOMs and LOMs demonstrated larger NITM than the EMMs and exhibited NITM additivity, but the EOMs also exhibited prolonged decay of NITM compared with the EMMs and LOMs. PMs, but not SMs, exhibited additivity of NITM. These findings may be attributed to impaired sympathetic function in the subjects with myopia. It is speculated that with repeated cycles of near work, residual NITM may contribute to the progression of permanent myopia.

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mentioning

confidence: 99%

Additivity of Near Work–Induced Transient Myopia and Its Decay Characteristics in Different Refractive Groups

Vasudevan

Ciuffreda

2008

Invest. Ophthalmol. Vis. Sci.

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“…21 The NITM is a phenomenon which reflects accommodative after effect/hysteresis after near adaptation. [47][48][49] This is related to a defect of sympathetic inhibition and instability of the crystalline lenses to reduce its power appropriately and rapidly. 47,48 Myopes, especially PMs, tend to show greater magnitude and longer duration of NITM.…”

Section: Discussionmentioning

confidence: 99%

“…[47][48][49] This is related to a defect of sympathetic inhibition and instability of the crystalline lenses to reduce its power appropriately and rapidly. 47,48 Myopes, especially PMs, tend to show greater magnitude and longer duration of NITM. 24,50 During the period of NITM, the image on the retina is in a myopic defocus condition when the subject views a distance target.…”

Section: Discussionmentioning

confidence: 99%

Effect of customized near addition lenses on transient myopia induced by near-work

Nan¹,

Seger²,

Crandall³

et al. 2010

OPTO

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Purpose: To verify whether optimal near add power can reduce near-work induced transient myopia (NITM). Methods: Eighteen subjects including nine progressive myopes (PMs) and nine stable myopes (SMs) were involved in this study. We measured the accommodative error and the near phoria at 40 cm under fully corrected conditions for each subject. These findings were then used to determine optimal near-add power for each subject based on formulae derived from a previous study. Under both with and without near-add conditions, NITM was obtained by comparing the refractions immediately before and after performing continuous computer work at 40 cm for an hour. The refraction was determined by a COAS aberrometer. Results: Using customized near-addition lenses (C-ADD) we found significantly decreased retinal defocus from 0.49 ± 0.12 (SD) D to 0.08 ± 0.11 D. The near phoria showed a significant exophoric shift from -1.84 ± 1.95 prism diopter (pd) to -5.37 ± 1.63 pd, but was still in the normal range. We also found that the differences in NITM between the two groups and between the two conditions (ie, with and without C-ADD) were both significant. Further comparisons indicated that the NITM in the SM group was significantly reduced after using C-ADD; in the PM group the reduction of NITM was not significant. Conclusions:The results suggest that C-ADD balances the load of accommodation and vergence, significantly decreasing retinal blur during the near-work, and may be able to reduce the NITM.

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“…10 Few studies have suggested relationship between near work, transient myopia and permanent myopicff. 11,12 Most of these studies have been done in western population and there are limited such studies on the role of cornea in myopia and the association of parental myopia and of near work on myopia in Indian population.…”

Section: Need For the Studymentioning

confidence: 99%

A Comparative Study in Axial Length of Eye and Radius of Curvature of Cornea Between Myopes and Emmetropes in Indian Population

Tasneem¹,

Nayak²,

Shwetha³

2015

jemds

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BACKGROUND AND OBJECTIVES:This study would help us understand the pathophysiology of Myopia in Indian population in a better way. The hypothesis being tested is that "the axial length of eye and radius of curvature of cornea is associated with myopia". The main objectives of the study are; 1. To compare the axial lengths in myopes and emmetropes. 2. To compare the radii of curvatures of cornea in myopes and emmetropes. 3. To study the changes in axial length and radius of corneal curvature in near-work induced transient myopia. 4. To study the association of parental myopia and near work on the onset of myopia. METHODS: Emmetropic and myopic individuals who attend the Ophthalmology OPD at

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Nearwork-induced transient myopia

Cited by 81 publications

References 41 publications

Additivity of Near Work–Induced Transient Myopia and Its Decay Characteristics in Different Refractive Groups

Additivity of Near Work–Induced Transient Myopia and Its Decay Characteristics in Different Refractive Groups

Effect of customized near addition lenses on transient myopia induced by near-work

A Comparative Study in Axial Length of Eye and Radius of Curvature of Cornea Between Myopes and Emmetropes in Indian Population

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