Sector Pupil Dilation with Phenylephrine and Tropicamide

Chang, Freddy W.; McCAN, Tim A.; Hitchcock, John R.

doi:10.1097/00006324-198507000-00008

Cited by 13 publications

(4 citation statements)

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“…Cyclopentolate and tropicamide both neutralize the iris' sphincter muscle, which consists of fibers that are arranged in a circular fashion and typically contract uniformly to constrict the pupil. When an appropriate agent inhibits the sphincter fibers, they relax and, as suggested by Chang et al, 29 collectively move after a short period of time to produce a symmetric dilation of the pupil. Neo-Synephrine, however, acts on the dilator muscle of the iris, which consists of several radiating fiber strands that can contract independently to dilate the iris.…”

Section: Discussionmentioning

confidence: 99%

“…22 As shown in Figure 4, the iris thinned more in the inferonasal direction after being dilated with Neo-Synephrine 2.5% in most eyes, accounting for the inferonasal shift in pupil center location with dilation. Chang et al 29 found that phenylephrine 2.5% produced an uneven dilation of the pupil, particularly in the vertical direction, while tropicamide 1% yielded a symmetrical dilation.…”

Section: Discussionmentioning

confidence: 99%

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Aberrations induced in wavefront-guided laser refractive surgery due to shifts between natural and dilated pupil center locations

Porter

Yoon²,

Lozano³

et al. 2006

Journal of Cataract and Refractive Surgery

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Measuring aberrations over a Neo-Synephrine-dilated pupil and treating them over an undilated pupil typically resulted in a shift of the wavefront-guided ablation in the superotemporal direction and an induction of higher-order aberrations. Methods referencing the aberration measurement and treatment with respect to a fixed feature on the eye will reduce the potential for inducing aberrations due to shifts in pupil center.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Aberrations induced in wavefront-guided laser refractive surgery due to shifts between natural and dilated pupil center locations

Porter

Yoon²,

Lozano³

et al. 2006

Journal of Cataract and Refractive Surgery

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“…8, April mydriatic effect of this particular drug on the pupil is sufficiently persistent that this factor was of minimal importance, its duration being over 180 min, with maximum dilation occurring some 15-20 min after instillation (Ward and Charman, 1986). Although it has been suggested that sector dilation of the pupil can be obtained using weak mydriatics (Chang, McCan and Hitchcock, 1985), this is unlikely to occur with 1 % cyclopen tolate.…”

Section: Methodsmentioning

confidence: 96%

The effect of mydriasis on the pupillary centration of the human eye

Walsh¹

1988

Ophthalmic Physiologic Optic

115

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The change in pupil centration occurring as the human eye pupil dilates, both naturally in darkness and following the use of a mydriatic drug (cyclopentolate HCl, 1%), has been measured photographically. In both cases, changes in centration of up to 0.4 mm have been found. Using available ocular wavefront aberration data, modulation transfer curves have been derived for two eyes for centration changes of 0.2 mm. The importance of these changes in the formation of the retinal image, and hence on visual performance, is discussed.

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“…Similarly, any sectoral differences in the drug effect might result in slight variations in lens centration and tilt, and hence coma. This possibility is not unreasonable, since sectoral differences have been observed using Scheimpflug photography when the pupil was dilated pharmacologically (Chang et al. , 1985).…”

Section: Discussionmentioning

confidence: 99%

Comparison of the ocular wavefront aberration between pharmacologically‐induced and stimulus‐driven accommodation

Plainis

Plevridi

Pallikaris

2009

Ophthalmic Physiologic Optic

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Measuring the pilocarpine-induced accommodative response at only one time point after its application may lead to misleading results. The considerable inter-individual differences in the time course of drug-induced accommodative response and its magnitude may lead to overestimation or underestimation of the corresponding amplitude of normal, blur-driven accommodation. Stimulating accommodation by topical application of pilocarpine is inappropriate for evaluating the efficacy of 'accommodating' IOLs.

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Sector Pupil Dilation with Phenylephrine and Tropicamide

Cited by 13 publications

References 0 publications

Aberrations induced in wavefront-guided laser refractive surgery due to shifts between natural and dilated pupil center locations

Aberrations induced in wavefront-guided laser refractive surgery due to shifts between natural and dilated pupil center locations

The effect of mydriasis on the pupillary centration of the human eye

Comparison of the ocular wavefront aberration between pharmacologically‐induced and stimulus‐driven accommodation

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