Keratoconus and corneal stability after radial keratectomy in the fellow eye: case report

Sousa, Jacqueline Martins de; Hirai, Flávio E.; Sato, Élcio Hideo

doi:10.1590/s0004-27492013000300014

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The complications of RK range from the seriously sight-threatening to less severe problems, including corneal perforations, accidental incisions across the visual axis, a decentered clear zone, limbal incisions, visual fluctuations, corneal edema [ 10 ], glare [ 10 , 11 ], and falsely low IOP values [ 12 ]. RK may also confer a greater chance of iatrogenic keratoconus, although this speculation remains a matter of debate [ 13 , 14 ]. Conversely, one case report suggested that corneal stability following RK may protect against keratoconus [ 13 ].…”

Section: Discussionmentioning

confidence: 99%

“…RK may also confer a greater chance of iatrogenic keratoconus, although this speculation remains a matter of debate [ 13 , 14 ]. Conversely, one case report suggested that corneal stability following RK may protect against keratoconus [ 13 ]. The long-term, unintended refractive outcomes of RK noted in the literature include BCVA reduction, irregular astigmatism, over-correction, under-correction, and hyperopic shift [ 10 , 15 ].…”

Section: Discussionmentioning

confidence: 99%

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Correction of hyperopia with astigmatism following radial keratotomy with daily disposable plus spherical contact lens: a case report

Chen

Hou

et al. 2017

Int Ophthalmol

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PurposeTo report the refractive correction in a case of hyperopia and astigmatism following radial keratotomy.MethodsA case report.ResultsA 47-year-old woman, who had undergone refractive surgery for radial keratotomy in both eyes 22 years before the present study, presented to our clinic with blurred vision. Her best corrected visual acuity, with spectacle correction of +3.50 DS/−1.50 DCX130° in the right eye and +3.75 DS/−1.50 DCX80° in the left eye, was 0.2 logMAR and 0.3 logMAR, respectively. Her keratometric readings were 35.75 D/36.75 D at 74° and 35.25 D/36.25 D at 61°, respectively. Prompted by intolerance to glasses, the patient requested for contact lenses. First, we applied a rigid, gas-permeable contact lens. However, we noted poor fitting due to central corneal flattening. Subsequently, we applied a conventional plus spherical soft contact lens (PSSCL), which is thick in the center and can therefore correct hyperopia and low-grade astigmatism simultaneously. The conventional PSSCL showed slightly inferior decentration, with good movement, and the patient was satisfied with it. After ascertaining the patient’s living habits, we decided that a daily disposable soft contact lens would most meet her needs. The final prescription was a daily disposable PSSCL; the patient was satisfied with her corrected visual acuity of 0.0 logMAR in the right eye and 0.0 logMAR in left eye. Her daily disposable PSSCL-corrected visual acuity was stable during the 10-month follow-up.ConclusionFor patients displaying hyperopia with astigmatism following radial keratotomy, the PSSCL may confer better corrected visual acuity and acceptability.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Correction of hyperopia with astigmatism following radial keratotomy with daily disposable plus spherical contact lens: a case report

Chen

Hou

et al. 2017

Int Ophthalmol

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A Parametric Investigation of Corneal Laser Surgery Based on the Multilayer Dynamic Photothermal Model

Zhang

Ren

Yin³

et al. 2020

Journal of Biomechanical Engineering

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Corneal laser surgery is a widely used method for the treatment of ocular myopia, hyperopia, and astigmatism. Although it is a well-established technique, the photothermal properties of the cornea are often overlooked, causing unexpected changes in temperature during laser irradiation. Therefore, there is a need for further investigation of the temperature response of the cornea under laser irradiation. In the present work, a photo-thermal corneal numerical model is presented, assuming the stratification of the cornea with laser ablation in a uncoagulated layer, a coagulated layer, a dehydrating layer, a dried layer , and a carbonized layer. The modified Pennes' bioheat transfer equation and Lambert-Beer's law are applied to simulate heat transfer in the corneal tissue during laser irradiation. The corneal dynamic photothermal parameters are considered in the proposed model. The central surface temperature, boundary and thickness of each layer, and thermal damage during laser irradiation are investigated. It was found that in the steady-state process, the thickness of the coagulated layer was 2.6, 14.4, and 52.4 times larger than that of the dehydrating layer, dried layer, and carbonized layer, respectively. The thickness of the corneal thermal damage gradually increased, and reached a peak of 0.196 mm at about 18.2 ms. Subsequently, it sharply decreases by 0.01mm before stabilizing. On this basis, the influence of laser intensity is investigated. The parametric investigation and analysis presented provide a theoretical basis for corneal laser surgery.

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Keratoconus and corneal stability after radial keratectomy in the fellow eye: case report

Cited by 2 publications

References 8 publications

Correction of hyperopia with astigmatism following radial keratotomy with daily disposable plus spherical contact lens: a case report

Correction of hyperopia with astigmatism following radial keratotomy with daily disposable plus spherical contact lens: a case report

A Parametric Investigation of Corneal Laser Surgery Based on the Multilayer Dynamic Photothermal Model

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