Estudo dos movimentos torcionais em cirurgia refrativa

Rocha, Guilherme José Nunes Marques; Bisneto, Otávio Siqueira; Moreira, Hamílton

doi:10.1590/s0004-27492005000600011

Cited by 2 publications

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References 4 publications

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“…These movements occur when we tilt our head over the shoulder or when we lay down (4) . The cyclotorsion needs to be taken into account when a corneal laser eye correction is to be done.…”

Section: Introductionmentioning

confidence: 99%

Cyclotorsion measurement in laser refractive surgery

Lucena¹,

Mota²,

Lucena³

et al. 2013

Arq. Bras. Oftalmol.

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Artigo Original | Original article INTRODUCTIONAstigmatism is a common refractive error that generates multiple focal points over the retina. It's frequently caused by an asymmetry in the corneal curvature. When the two corneal meridians are at right angle, the ametropia can be corrected with spectacles (regular astigmatism). When there are irregularities in the meridians or they are not at right angle, it's called irregular astigmatism, and does not allow correction with spectacles (1) .Mild torsional alignment errors in the astigmatism axis (greater than 3°), can lead to a clinically significant reduction in the efficiency of the laser treatment in eyes with moderate to high astigmatism (2) .The torsional movements are defined as: a) excycloversion -when the upper pole of the eye rotates to the temporal side; b) incycloversion -when the upper pole of the eye rotates to the nasal side (3) . The inferior oblique and inferior rectus muscles are responsible for the excycloversion and the superior oblique and superior rectus muscles ABSTRACT Purpose: The aim of this study was to verify the presence of cyclotorsion in eyes that underwent laser refractive surgery. Methods: This was a comparative observational study, which analyzed the medical records of 61 patients (104 eyes) who underwent laser refractive surgery and compared the axis of astigmatism of the sitting and the supine positions. Regarding the gender, 37.5% were male and 62.5% were female. The age ranged from 20 to 54 years old, with the median of 29 years. The lowest degree of astigmatism was -0.75 cylinder diopters (DC) and the highest was -6.50 DC, with a mean of -3.06 ± 1.16 DC. First, the axis of astigmatism of the seated patient was captured by the Schwind's ORK-CAM. In a second moment, inside the operating room, the axis of astigmatism of the patient in supine position was captured by the laser equipment's own camera (Schwind Amaris®), which was then compared with the previous measure. The incyclotorsion was defined by a minus sign (-) and the excyclotorsion, by a plus sign (+). Results: The maximum excyclotorsion was +7.7 and the maximum incyclotorsion was -11.0 degrees. The mean torsion (excyclo or incyclo) was 2.74 (56.7%), with a standard deviation of 2.30 degrees. There was no statistically significant change (p=0.985) in the axis of astigmatism between patients sitting versus supine. Conclusion: There was clinically significant cyclotorsion in 36.5% of the eyes submitted to laser correction.

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“…These movements occur when we tilt our head over the shoulder or when we lay down (4) . The cyclotorsion needs to be taken into account when a corneal laser eye correction is to be done.…”

Section: Introductionmentioning

confidence: 99%

Cyclotorsion measurement in laser refractive surgery

Lucena¹,

Mota²,

Lucena³

et al. 2013

Arq. Bras. Oftalmol.

View full text Add to dashboard Cite

show abstract

“…Cyclotorsional movements occur to maintain the natural orientation of the image on the retina in monocular viewing conditions and when an individual tilts head or lies down [123]. Incyclotorsion and excyclotorsion are two kinds of cyclotorsional movement distinguished by the orientation.…”

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confidence: 99%

Effects of Cyclotorsion Orientation and Magnitude in Eyes with Compound Myopic Astigmatism on the Compensation Capacity of WaveLight EX500 Photorefractive Keratectomy

Özülken

İlhan²

2019

Korean J Ophthalmol

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PurposeTo investigate the clinical effects of different orientation and magnitude of cyclotorsion on the compensation capacity of the WaveLight EX500 photorefractive keratectomy (PRK) platform.MethodsThis retrospective study comprised 400 eyes of 200 patients who underwent bilateral simultaneous PRK due to compound myopic astigmatism. The subjects were separated according to the orientation of cyclotorsion into incyclotorsion and excyclotorsion groups, and by the magnitude of cyclotorsion into group 1 (0.50 to 2.50 degrees), group 2 (3.00 to 5.00 degrees), group 3 (5.50 to 7.50 degrees), and group 4 (8.00 to 9.50 degrees).ResultsThe mean magnitude of cyclotorsion was 3.50 ± 2.4 degrees (0.50 to 9.50 degrees) in the incyclotorsion group and 3.32 ± 2.3 degrees (0.50 to 9.50 degrees) in the excyclotorsion group (p = 0.617). The postoperative refractive outcomes of the incyclotorsion and excyclotorsion groups were similar (p > 0.05 for all). The postoperative mean cylindrical refractive error was −0.32 ± 0.3 diopters (D, −1.25 to 0.00 D) in group 1, −0.47 ± 0.2 D (−2.00 to 0.00 D) in group 2, −0.62 ± 0.2 D (−1.00 to −0.25 D) in group 3, and −0.91 ± 0.2 D (−1.50 to −0.50 D) in group 4 (p < 0.001). Preoperative cylindrical refractive error was positively correlated with magnitude of cyclotorsion (r = 0.125 and p = 0.013), which was also positively correlated with postoperative cylindrical refractive error (r = 0.600 and p < 0.001).ConclusionsIncyclotorsion and excyclotorsion can be equally compensable in the WaveLight EX500 PRK platform for compound myopic astigmatism. A value of ≤2.50 degrees cyclotorsion magnitude was observed to be more compensable than higher degrees of cyclotorsion magnitude. Preoperative high astigmatism was associated with high cyclotorsion magnitude, which was also associated with a high degree of postoperative astigmatism.

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Estudo dos movimentos torcionais em cirurgia refrativa

Cited by 2 publications

References 4 publications

Cyclotorsion measurement in laser refractive surgery

Cyclotorsion measurement in laser refractive surgery

Effects of Cyclotorsion Orientation and Magnitude in Eyes with Compound Myopic Astigmatism on the Compensation Capacity of WaveLight EX500 Photorefractive Keratectomy

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