Progressive hyperopic shift after radial keratotomy: possible causes

Sé, Avetisov; Aa, Antonov; Sv, Vostrukhin

doi:10.17116/oftalma2015131213-18

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…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 ]. The possible causes of this progressive hyperopic shift are low corneal rigidity and elevated intraocular pressure [ 16 ].…”

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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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%

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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“…После выполнения РК нередко наблюдается оптическая деформация интерфейса роговицы вследствие снижения биомеханической прочности стромальной ткани, что в большинстве случаев связано с наличием макро-и микроперфораций, полученных в ходе проведения рефракционной хирургии, а также неравномерным процессом рубцевания в каждом отдельно взятом радиальном разрезе [2][3][4][5].…”

Section: оригинальные исследованияunclassified

Toric IOL Implantation in Patients with Previously Performed Radial Keratotomy

Лихорад¹,

Беляковский²,

Позняк³

2022

Офтальмология. Восточная Европа

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Представлены результаты оперативного лечения по поводу катаракты либо с рефракционной целью 20 пациентов (26 глаз) с ранее выполненной радиальной кератотомией. Имплантированы монофокальные торические ИОЛ SN6AT3-8 (Alcon). Расчет силы линз выполнялся по формулам: Holladay II с поправкой на радиальную кератотомию, Hoffer Q, ASСRS IOL calculator. Торический компонент рассчитывался с помощью формулы Barrett. Не отмечено преимуществ при применении вышеуказанных формул в достижении целевой рефракции. Вероятность рефракционных ошибок выше на глазах с высокой иррегулярностью роговицы. Операции выполнялись амбулаторно. В результате хирургического лечения улучшились клинико-функциональные результаты: рефракции, некорригированной и максимально корригированной остроты зрения. Результаты оставались высокими в период наблюдения от 6 до 26 месяцев. Применение монофокальных торических ИОЛ позволяет приблизиться к рефракции цели и получить удовлетворяющий пациента результат хирургии. The results of surgical treatment for cataracts or with a refractive aim of 20 patients (26 eyes) with a previously performed radial keratotomy are presented. Monofocal toric IOL SN6AT3-8 (Alcon) were implanted. The lens power was calculated using the followingformulas: Holladay II corrected for radial keratotomy, Hoffer Q, ASСRS IOL calculator. The toric component was calculated using the Barrett formula. No advantages were noted in the application of the mentioned above formulas in achieving the target refraction. The probability of refractive errors is bigger in eyes with high corneal irregularity. The operations were performed on an outpatient basis. As a result of surgical treatment an improvement in the following clinical and functional results was obtained: refraction, uncorrected and maximally corrected visual acuity. The results remained high during the observation period from 6 to 26 months. The use of monofocal toric IOLs allows to approach the target refraction and obtain a patient-satisfying surgical result.

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“…Для глаз после выполненной ранее ПРК в отдалённом периоде характерно наличие индуцированного астигматизма в 3-15 % случаев, гиперметропический сдвиг (связанный с нарушением техники операции и возникновением макро-и микроперфораций), неравномерные процессы рубцевания, снижение механической прочности роговицы [1,2,3,4,5]. В ряде случаев после ПРК имеет место выраженная оптическая деформация роговицы, что приводит к увеличению аберраций высокого порядка и ухудшению качества зрения [6,7].…”

Section: актуальностьunclassified

Analysis of Optical Properties of Posterior Surface of Cornea in Patients after Anterior Radial Keratotomy

Tsyrenzhapova

Розанова

Селиверстова

2019

Acta biomedica scientifica

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Taking into account the constant increase in patients with age-related cataracts after radial keratotomy, a careful analysis of both the optical and anatomical properties of the cornea with the examination of the posterior surface is of particular importance.Aim. To analyze the optical properties of the posterior surface of the cornea in patients after anterior radial keratotomy. Materials and methods. An examination of 24 patients (48 eyes) with age-related cataracts of varying degrees of density, myopia and the presence of a previous anterior radial keratotomy or radial-tangential keratotomy in history. The average age of patients was 59.5 years (from 47 to 68), there were 19 women and 5 men.Results. The radius of curvature of the anterior surface in patients after anterior radial keratotomy was 9.45 ± 0.91 mm on average along the meridians, which is significantly more in comparison with these indices in control patients – 7.70 ± 0.19 mm (p = 0.0001). The ratio of the radii of the posterior cornea curvature to the anterior radius on average along the meridians in patients after anterior radial keratotomy was 1.07 ± 0.70, and in control patients – 1.20 ± 0.02 (p = 0.0001). The keratometric index in patients after anterior radial keratotomy was 1.3538 ± 0.0239, and in the control group – 1.3372 ± 0.0003 (p = 0.23).Conclusion. In patients after anterior radial keratotomy, keratometry of the posterior surface of the cornea is significantly higher than in the control. The ratio of the radius of curvature of the posterior cornea to the radius of curvature of the anterior cornea varies significantly after anterior radial keratotomy, which is due to a more pronounced flattening of the posterior cornea. The standard keratometric index (1.3375) is invalid for patients after anterior radial keratotomy and must be calculated individually for each patient when deciding on the operative treatment of cataracts.

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Progressive hyperopic shift after radial keratotomy: possible causes

Cited by 11 publications

References 3 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

Toric IOL Implantation in Patients with Previously Performed Radial Keratotomy

Analysis of Optical Properties of Posterior Surface of Cornea in Patients after Anterior Radial Keratotomy

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