Cyclotorsion: a possible cause of residual astigmatism in refractive surgery

Martha J Tjon-Fo-Sang; Jan-Tjeerd H N de Faber; Christine Kingma; W Houdijn Beekhuis

doi:10.1016/s0886-3350(01)01279-2

Cyclotorsion: a possible cause of residual astigmatism in refractive surgery

Martha J Tjon-Fo-Sang, Jan-Tjeerd H N de Faber, Christine Kingma, W Houdijn Beekhuis

Children's Eye Centre

Research output: Contribution to journal › Article › Research › peer-review

Abstract

PURPOSE: To determine whether cyclotorsion occurs when a subject changes from binocular to monocular fixation and to assess positionally induced cyclotorsion.

SETTING: Clinics of the Rotterdam Eye Hospital, Rotterdam, The Netherlands.

METHODS: The axis of astigmatism was measured with the Nidek handheld keratometer in 15 normal subjects under monocular and binocular fixation and in seated and supine positions. The limits of agreement for the repeatability of measurements with the Nidek keratometer were used to identify subjects with statistically significant cyclotorsion.

RESULTS: Two subjects (13%) showed statistically significant excyclotorsion when changing from binocular to monocular fixation in a seated position. In a supine position, 3 subjects (20%) showed excyclotorsion when the fixation changed. Body position itself had no influence on ocular torsion.

CONCLUSIONS: Significant cyclotorsion may occur under monocular viewing conditions. If monocular photorefractive keratectomy procedures are based on binocular keratometry readings, an undercorrection of myopic astigmatism may result. Individuals at risk should be identified before refractive keratectomy is performed.

Original language	English
Pages (from-to)	599-602
Number of pages	4
Journal	Journal of Cataract and Refractive Surgery
Volume	28
Issue number	4
DOIs	https://doi.org/10.1016/s0886-3350(01)01279-2
Publication status	Published - Apr 2002

Keywords

Astigmatism/etiology
Corneal Diseases/complications
Eye Movements
Female
Fixation, Ocular
Humans
Lasers, Excimer
Male
Myopia/surgery
Photorefractive Keratectomy
Posture
Torsion Abnormality
Vision, Monocular

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10.1016/s0886-3350(01)01279-2

Cite this

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title = "Cyclotorsion: a possible cause of residual astigmatism in refractive surgery",

abstract = "PURPOSE: To determine whether cyclotorsion occurs when a subject changes from binocular to monocular fixation and to assess positionally induced cyclotorsion.SETTING: Clinics of the Rotterdam Eye Hospital, Rotterdam, The Netherlands.METHODS: The axis of astigmatism was measured with the Nidek handheld keratometer in 15 normal subjects under monocular and binocular fixation and in seated and supine positions. The limits of agreement for the repeatability of measurements with the Nidek keratometer were used to identify subjects with statistically significant cyclotorsion.RESULTS: Two subjects (13%) showed statistically significant excyclotorsion when changing from binocular to monocular fixation in a seated position. In a supine position, 3 subjects (20%) showed excyclotorsion when the fixation changed. Body position itself had no influence on ocular torsion.CONCLUSIONS: Significant cyclotorsion may occur under monocular viewing conditions. If monocular photorefractive keratectomy procedures are based on binocular keratometry readings, an undercorrection of myopic astigmatism may result. Individuals at risk should be identified before refractive keratectomy is performed.",

keywords = "Astigmatism/etiology, Corneal Diseases/complications, Eye Movements, Female, Fixation, Ocular, Humans, Lasers, Excimer, Male, Myopia/surgery, Photorefractive Keratectomy, Posture, Torsion Abnormality, Vision, Monocular",

author = "Tjon-Fo-Sang, {Martha J} and {de Faber}, {Jan-Tjeerd H N} and Christine Kingma and Beekhuis, {W Houdijn}",

year = "2002",

month = apr,

doi = "10.1016/s0886-3350(01)01279-2",

language = "English",

volume = "28",

pages = "599--602",

number = "4",

}

TY - JOUR

T1 - Cyclotorsion

T2 - a possible cause of residual astigmatism in refractive surgery

AU - Tjon-Fo-Sang, Martha J

AU - de Faber, Jan-Tjeerd H N

AU - Kingma, Christine

AU - Beekhuis, W Houdijn

PY - 2002/4

Y1 - 2002/4

N2 - PURPOSE: To determine whether cyclotorsion occurs when a subject changes from binocular to monocular fixation and to assess positionally induced cyclotorsion.SETTING: Clinics of the Rotterdam Eye Hospital, Rotterdam, The Netherlands.METHODS: The axis of astigmatism was measured with the Nidek handheld keratometer in 15 normal subjects under monocular and binocular fixation and in seated and supine positions. The limits of agreement for the repeatability of measurements with the Nidek keratometer were used to identify subjects with statistically significant cyclotorsion.RESULTS: Two subjects (13%) showed statistically significant excyclotorsion when changing from binocular to monocular fixation in a seated position. In a supine position, 3 subjects (20%) showed excyclotorsion when the fixation changed. Body position itself had no influence on ocular torsion.CONCLUSIONS: Significant cyclotorsion may occur under monocular viewing conditions. If monocular photorefractive keratectomy procedures are based on binocular keratometry readings, an undercorrection of myopic astigmatism may result. Individuals at risk should be identified before refractive keratectomy is performed.

AB - PURPOSE: To determine whether cyclotorsion occurs when a subject changes from binocular to monocular fixation and to assess positionally induced cyclotorsion.SETTING: Clinics of the Rotterdam Eye Hospital, Rotterdam, The Netherlands.METHODS: The axis of astigmatism was measured with the Nidek handheld keratometer in 15 normal subjects under monocular and binocular fixation and in seated and supine positions. The limits of agreement for the repeatability of measurements with the Nidek keratometer were used to identify subjects with statistically significant cyclotorsion.RESULTS: Two subjects (13%) showed statistically significant excyclotorsion when changing from binocular to monocular fixation in a seated position. In a supine position, 3 subjects (20%) showed excyclotorsion when the fixation changed. Body position itself had no influence on ocular torsion.CONCLUSIONS: Significant cyclotorsion may occur under monocular viewing conditions. If monocular photorefractive keratectomy procedures are based on binocular keratometry readings, an undercorrection of myopic astigmatism may result. Individuals at risk should be identified before refractive keratectomy is performed.

KW - Astigmatism/etiology

KW - Corneal Diseases/complications

KW - Eye Movements

KW - Female

KW - Fixation, Ocular

KW - Humans

KW - Lasers, Excimer

KW - Male

KW - Myopia/surgery

KW - Photorefractive Keratectomy

KW - Posture

KW - Torsion Abnormality

KW - Vision, Monocular

U2 - 10.1016/s0886-3350(01)01279-2

DO - 10.1016/s0886-3350(01)01279-2

M3 - Article

C2 - 11955898

SN - 0886-3350

VL - 28

SP - 599

EP - 602

JO - Journal of Cataract and Refractive Surgery

JF - Journal of Cataract and Refractive Surgery

IS - 4

ER -

Cyclotorsion: a possible cause of residual astigmatism in refractive surgery

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Keywords

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