Factors influencing intraocular pressure, corneal thickness and corneal biomechanics after congenital cataract surgery

Faramarzi, Azita; Feizi, Sepehr; Maghsoodlou, Ali

doi:10.1136/bjophthalmol-2016-310077

Cited by 12 publications

(13 citation statements)

References 19 publications

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“…In the studies undergone until present, significant differences have been observed between the biomechanical corneal values pre- and post-surgery. The CH value has decreased in the immediate post-surgically period and went back to the pre-surgically level in 1-2 weeks; no statistically significant change has been identified in the CRF values [ 42 - 44 ].…”

Section: Discussionmentioning

confidence: 99%

Correlations between corneal biomechanics and specular microscopy in patient with cataract

Iancu

Bujor

Iliuţă

et al. 2020

rjo

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This study aimed to analyze the connection between corneal biomechanics (corneal hysteresis, CH) and endothelial cell density of cornea (mean endothelial cell density, MCD) in patients diagnosed with cataract. This retrospective, observational study was performed in the Ophthalmology Clinic of the University Emergency Hospital in Bucharest. Of 60 patients (120 eyes) with cataract, who were included in this study, we analyzed the CH values obtained using with the Ocular Response Analyzer (ORA) and the MCD values obtained using the specular microscopy. The study groups comprised both men and women with ages ranging from 45 to 63 years. Patients were divided into three study groups according to CH values. In each batch, the CH values obtained with the Ocular Response Analyzer (ORA) were correlated with age, gender and MCD, then the subgroups were compared. All the data gathered showed no correlation to be statistically significant regarding the biomechanical properties of the cornea and the corneal endothelial cell density in patients with cataract.

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Section: Discussionmentioning

confidence: 99%

Correlations between corneal biomechanics and specular microscopy in patient with cataract

Iancu

Bujor

Iliuţă

et al. 2020

rjo

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“…Another school of thought for risk of developing glaucoma being more in aphakic group rather than in primary pseudophakia group is due to the exposure of the maturing angle structures and maturing cornea to harmful side effects of vitreous components. 8 This access to trabecular meshwork and cornea is less if artificial lens is implanted at the same time as that of cataractous lens extraction. So, increased CCT in aphakia and pseudophakia eyes following congenital cataract extraction and its effect on IOP measurement should be borne in mind before making a diagnosis of glaucoma and prescribing anti-glaucoma medications in children.…”

Section: Discussionmentioning

confidence: 99%

A Comparative Study of Increase in Central Corneal Thickness Following Congenital Cataract Surgery in Children

Chandrakumar¹,

Thasneemsuraiya²,

Anujoseph³

et al. 2017

jemds

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BACKGROUNDThe incidence rate of paediatric cataracts is high in developing countries like India 1 ; about 7.4 -15.3 % of childhood blindness is due to congenital cataract. Although cataract extraction is performed at early ages in these children to prevent stimulus deprivation amblyopia, other complications such as secondary glaucoma, 2 continue to threaten their long term visual outcome. It was observed that after congenital cataract extraction, the increase in central corneal thickness (CCT) leads to overestimation of Intraocular Pressure (IOP) by Goldman Applanation Tonometry (GAT); and hence overdiagnosis of glaucoma in operated children resulting in unnecessary use of antiglaucoma medications.Aims and Objectives-1) To determine the central corneal thickness in children following surgery for congenital cataract in primary/secondary pseudophakia and aphakia and compare with age-matched normal children. 2) To see the variation in central corneal thickness (CCT) following primary/secondary Posterior Chamber Intraocular Lens (PCIOL) implantation for congenital cataract. MATERIALS AND METHODSThis is a descriptive comparative study conducted among children under 12 years of age who underwent surgery for congenital cataract, who attended the Outpatient Department (OPD) as well as wards of Department of Ophthalmology and/or Institute of Paediatrics at Government Rajaji Hospital, Madurai. The duration of study was 10 months. Subjects, who fulfilled all eligibility criteria, and none of the exclusion criteria, were only recruited in this study after obtaining written informed consent from their parents/guardian. Out of 170 eyes included in this study, 27 were aphakic, 74 were pseudophakic eyes (46 with primary intraocular lens implantation and 28 with secondary intraocular lens implantation) and 69 unoperated eyes in these subjects were taken as controls as preliminary CCT values were unavailable for the aphakic/pseudophakic eyes. A detailed evaluation of the anterior and posterior segment (dilated fundus examination) was done. Visual acuity was recorded in cooperative children. After explaining both the procedures; IOP & CCT measurement; topical anaesthetic drops (0.5% proparacaine) were instilled into the conjunctival sac. Intraocular pressure was recorded with GAT and in uncooperative children with Perkin's handheld Applanation tonometer. After 5 minutes, child is reassured and asked to fix at a distant target. CCT was measured using ultrasonic pachymeter by placing the tip of the probe gently on the centre of cornea. An average of 5 readings is taken. Uncooperative children were examined under oral sedatives. After IOP and CCT measurement, these were compared to the IOP and CCT readings of their corresponding age-matched healthy children. RESULTSThe age distribution of cases and controls varied from 4 -12 years. There was no significant difference in age between the study group and control group. Among the 85 children (170 eyes) studied, 52 were male and 33 were female. In the study group, total number of...

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“…[7][8][9][10] Several previous studies have demonstrated that corneal thickness and biomechanics change after congenital cataract surgery. Faramarzi et al 11 recently demonstrated that CCT increased and corneal hysteresis (CH) decreased after congenital cataract surgery without intraocular lens (IOL) implantation, whereas primary IOL implantation preserved corneal thickness and biomechanics. 11 Muir et al 12 found that CCT increased after congenital cataract surgery and mean CCT was greater in aphakic eyes than in pseudophakic eyes.…”

Section: Introductionmentioning

confidence: 99%

“…Faramarzi et al 11 recently demonstrated that CCT increased and corneal hysteresis (CH) decreased after congenital cataract surgery without intraocular lens (IOL) implantation, whereas primary IOL implantation preserved corneal thickness and biomechanics. 11 Muir et al 12 found that CCT increased after congenital cataract surgery and mean CCT was greater in aphakic eyes than in pseudophakic eyes. Simsek et al 13 reported a significant difference in CCT between aphakic eyes and pseudophakic eyes in which an IOL was implanted at the time of congenital cataract surgery.…”

Section: Introductionmentioning

confidence: 99%

“…14 Any alterations in corneal features can make GAT measurements inaccurate and misleading with respect to diagnosing glaucoma. [11][12][13][14][15][16][17] The ocular response analyzer (ORA; Reichert Ophthalmic Instruments, Buffalo, NY, USA) is a noncontact tonometer that measures IOP and corneal biomechanics. 18 Cornea-compensated IOP (IOP CC ) measured by the ORA determines IOP values, which is less dependent on corneal characteristics such as corneal thickness and biomechanics.…”

Section: Introductionmentioning

confidence: 99%

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Goldmann applanation tonometer versus ocular response analyzer for measuring intraocular pressure after congenital cataract surgery

Feizi

Faramarzi

Kheiri

2018

European Journal of Ophthalmology

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The Goldmann applanation tonometer and ocular response analyzer cannot be used interchangeably for measuring intraocular pressure after congenital cataract surgery. The difference between the cornea-compensated intraocular pressure and intraocular pressure measured with Goldmann applanation tonometer was primarily affected by central corneal thickness and corneal hysteresis. Among the subgroups, the primary pseudophakic subgroup had the thinnest cornea and the highest corneal hysteresis values and demonstrated the best agreement between the two tonometers.

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Factors influencing intraocular pressure, corneal thickness and corneal biomechanics after congenital cataract surgery

Cited by 12 publications

References 19 publications

Correlations between corneal biomechanics and specular microscopy in patient with cataract

Correlations between corneal biomechanics and specular microscopy in patient with cataract

A Comparative Study of Increase in Central Corneal Thickness Following Congenital Cataract Surgery in Children

Goldmann applanation tonometer versus ocular response analyzer for measuring intraocular pressure after congenital cataract surgery

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