Biomechanics in DALK: Big bubble vs manual lamellar dissection.

Abstract:

PURPOSE:The present study's aim was to compare the biomechanical properties of corneal tissue in patients who underwent deep anterior lamellar keratoplasty (DALK) surgery, with successful big bubble formation and manual lamellar dissection, during failed big bubble formation. METHODS:This retrospective comparative study included 60 eyes from 60 keratoconus patients who previously underwent DALK surgery. These patients were categorized as big bubble (+) or big bubble (-) based on the success or failure of big bubble formation during the surgery. The big bubble (+) group included 42 eyes, while the big bubble (-) group had 18 eyes. Moreover, the patients were regrouped as 0.25 mm and 0.50 mm to evaluate the effects of the disparity between donor and trephine punches on the biomechanical properties of the cornea. These biomechanical properties, characterized by corneal hysteresis and the corneal resistance factor, were measured using the Ocular Response Analyzer 12 months after the surgery. RESULTS:There was no statistically significant difference between the big bubble (+) and big bubble (-) groups in the biomechanical properties of the cornea (corneal hysteresis: 10.06, 10.25; p=0.716/corneal resistance factor: 10.15, 10.07; p=0.805, respectively). In addition, pachymetry results were not statistically different between the two groups. Multivariate regression analysis revealed that corneal hysteresis and corneal resistance factor were positively associated with central corneal thickness (p<0.001/r2=0.506; p<0.001/r2=0.561, respectively). However, the study did not demonstrate a relationship between any of the punch sizes and corneal hysteresis or between the punch sizes (p=0.673) and the corneal resistance factor (p=0.643). CONCLUSIONS:The corneal hysteresis and corneal resistance factor values were similar in big bubble and manual lamellar dissection after DALK. Thus, manual lamellar dissection was not a disadvantage considering the cornea's biomechanical properties.

journal_name

Arq Bras Oftalmol

authors

Akdemir MO,Acar BT,Acar S

doi

10.5935/0004-2749.20200022

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

87-91

issue

2

eissn

0004-2749

issn

1678-2925

pii

S0004-27492020000200087

journal_volume

83

pub_type

杂志文章
  • Bupivacaine injection for comitant horizontal strabismus: clinical and radiological results.

    abstract:PURPOSE:To report the outcomes of bupivacaine injection for the treatment of comitant horizontal strabismus and evaluate clinical effectiveness and associated radiological changes. METHODS:This prospective observational clinical study was conducted on 10 patients with comitant horizontal strabismus of up to 40 prism d...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20200032

    authors: Karaca U,Altinsoy Hİ,Mutlu FM,Ceylan OM

    更新日期:2020-06-01 00:00:00

  • [Intraorbital extraocular Langerhans' cell granuloma: primary surgical approach. Why? - case report].

    abstract::We present a case in which a patient with intraorbital Langerhans' cell granuloma, with anatomical and functional skills compromised by intraorbital hypertension, which was treated with urgency orbitotomy by cranial approach. Male, two years-old, presented conjuntival proptosis, red eye, complete ophthalmoplegy, exoph...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492009000100018

    authors: Valentim Neto JG,Schaurich CG

    更新日期:2009-01-01 00:00:00

  • Upper lid crease approach for margin rotation in trachomatous cicatricial entropion without external sutures.

    abstract:PURPOSE:To describe the use of a lid crease incision for upper eyelid margin rotation in cicatricial entropion combining internal traction on the anterior lamella, tarsotomy, and tarsal overlap without external sutures. METHODS:Surgical description: The main steps of the procedure consisted of exposure of the entire t...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20150097

    authors: Cruz AA,Akaishi PM,Al-Dufaileej M,Galindo-Ferreiro A

    更新日期:2015-11-01 00:00:00

  • Comparison of central corneal thickness estimated by an ultrasonic pachymeter and non-contact specular microscopy.

    abstract:Purpose::To compare central corneal thickness (CCT) measurements of healthy individuals obtained with ultrasonic pachymetry (UP) and non-contact specular microscopy (NCSM). Method::In total, 148 eyes of 74 subjects with no ocular or systemic diseases were included in the study. Central corneal thickness measurements o...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20160089

    authors: Çevik SG,Duman R,Çevik MT,Kıvanç SA,Akova-Budak B,Perente I,Duman R

    更新日期:2016-09-01 00:00:00

  • Clinical outcomes of ocular surface in patients treated with vitamin D oral replacement.

    abstract:PURPOSE:To analyze the clinical outcomes of the ocular surface in patients with vitamin D deficiency after oral replacement. METHODS:A total of 40 patients with vitamin D deficiency were enrolled in the study. The patients received 50,000 units of oral vitamin D weekly over a period of 8 weeks. After 8 weeks, 1,500-2,...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20200043

    authors: Karaca EE,Kemer ÖE,Özek D,Berker D,Imga NN

    更新日期:2020-08-01 00:00:00

  • Syphilitic retinitis and panuveitis simulating acute retinal necrosis: case report.

    abstract::Retinitis and panuveitis in immunocompetent patients is a rare and sight-threatening disease, of difficult diagnosis. A case of a 31-year-old male who presented with unilateral placoid retinitis and panuveitis, unsuccessfully treated as acute retinal necrosis, that in fact was syphilis, with neurosyphilis and excellen...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492010000300016

    authors: Zambon F,Silva FL,Cavalcante AF,Nakashima Y,Helal J Jr

    更新日期:2010-05-01 00:00:00

  • [Preoperative evaluation and cataract surgery].

    abstract:PURPOSE:Analysis of the relevance of preoperative evaluation to prevent adverse clinical events, pre- and postoperative, on cataract surgery. METHODS:The study includes 1254 patients submitted to cataract surgery at the Instituto da Catarata do Departamento de Oftalmologia da UNIFESP - EPM, in the period of Jan - Dec ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492007000400014

    authors: Tallo FS,Soriano ES,Alvarenga LS

    更新日期:2007-07-01 00:00:00

  • [Optical coherence tomography macular study on eyes filled with silicone oil].

    abstract:PURPOSE:To demonstrate optical coherence tomography efficacy to evaluate macular anatomical outcomes, in eyes with silicone oil-filled vitreous cavity after vitrectomy. METHODS:A descriptive observational study of 28 (twenty-eight) patients submitted to pars plana vitrectomy having silicone oil as vitreous substitute....

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492007000200017

    authors: Maia OO Jr,Takahashi WY,Nakashima Y,Primiano Júnior HP,Takahashi BS,Nakashima AF

    更新日期:2007-03-01 00:00:00

  • [Miscellaneous orbital implant for anophthalmic cavity reconstruction surgery: case report].

    abstract::A new model of orbital implant, matching the low cost of acrylic implants (PMMA) with the advantages of medpor (Porex) is presented herein. The new implant model consists of a PMMA implant with a dura mater scrap adhered on its anterior face of the same diameter of the acrylic implant and a medpor snip adhered on its ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492010000100015

    authors: Araf D,Assae OM,Brito RV,Aquino G Jr,Silva TA

    更新日期:2010-01-01 00:00:00

  • [Risk of contamination of trypan blue dye after first use].

    abstract:PURPOSE:To determine the potential risk of contamination of a trypan blue bottle (TB) after first use and after being stored under different temperature and humidity conditions, as well as to identify possible contamination factors, most frequently involved microorganisms and simultaneously evaluate bacteriostatic and ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492006000100006

    authors: Malta JB,Felberg S,Murça MA,Barros MA,Mimica LM

    更新日期:2006-01-01 00:00:00

  • Anterior ischemic optic neuropathy associated with metabolic syndrome.

    abstract:PURPOSE:Metabolic syndrome denotes a common cluster of naturally connected risk factors including obesity, elevated blood pressure, insulin resistance, dyslipidemia, proinflammatory state and prothrombotic state. Anterior ischemic optic neuropathy is an acute ischaemic disorder of the optic nerve head and may lead to s...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492008000100013

    authors: Kosanovic-Jakovic N,Ivanovic B,Milenkovic S,Risovic D,Dimitrijevic-Sreckovic V,Radosavljevic A,Risimic D,Resan M

    更新日期:2008-01-01 00:00:00

  • Late recurrent iris synechia following laser goniopuncture for deep sclerectomy enhancement: case report.

    abstract::We report a case of recurrent iris synechiae one year after Nd:YAG laser goniopuncture for deep sclerectomy enhancement in the only functional eye of a patient with end-stage glaucoma. The possible pathophysiology of this uncommon complication and laser treatment aspects are discussed. ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492012000600014

    authors: Hilgert CR,Hilgert GL,Hardoim VA,Omi CA

    更新日期:2012-11-01 00:00:00

  • Hemorrhagic retinopathy in an infant with hemolytic-uremic syndrome.

    abstract::We describe the case of a 23-month-old female infant with a diagnosis of hemolytic uremic syndrome (HUS) and hemorrhagic retinopathy. The patient had a past history of abdominal pain, bloody diarrhea, and acute renal failure. On ophthalmologic examination, indirect ophthalmoscopy revealed extensive areas of flame-shap...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20140099

    authors: Geraissate JC,Yamamoto RE,Isaac DL,Ávila MP

    更新日期:2014-11-01 00:00:00

  • Use of automated quantitative pupillometric evaluation for monitoring the severity of diabetic retinopathy.

    abstract:PURPOSE:We aimed to evaluate the use of automated quantitative static and dynamic pupillometry in screening patients with type 2 diabetes mellitus and different stages of diabetic retinopathy. METHOD:155 patients with type 2 diabetes mellitus (diabetes mellitus group) were included in this study and another 145 age- a...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20210007

    authors: Cankurtaran V,Ilhan C,Tekin K,Citirik M,Dirican E,Gurkan E

    更新日期:2021-01-01 00:00:00

  • Approach of Turkish ophthalmologists to micronutrition in age-related macular degeneration.

    abstract:PURPOSE:To evaluate the knowledge and behaviors of ophthalmologists in Turkey concerning micronutrition support in patients with age related macular degeneration (ARMD). METHODS:This study involved 1,845 ophthalmologists. A scientific poll was sent to all participants by email. The survey covered the following: demogr...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20150004

    authors: Muhammed Ş,Yüksel H,Şahin A,Cingü AK,Türkcü FM,Özkurt ZG,Çaça İ

    更新日期:2015-01-01 00:00:00

  • A case of recurrent keratitis caused by Paecilomyces lilacinus and treated by voriconazole.

    abstract::We describe here a case of a 21-year-old woman who presented with low visual acuity, pain, and hyperemia in the left eye for 45 days. Her eye had extensive corneal infiltrate, with melting and a central perforation that was glued with cyanoacrylate, but with Seidel (+). She underwent tectonic corneal transplantation, ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 信件

    doi:10.5935/0004-2749.20190031

    authors: Gracitelli CPB,Ferrar PV,Pereira CAP,Hirai FE,de Freitas D

    更新日期:2019-03-01 00:00:00

  • [Congenital retinal macrovessel: case report].

    abstract::The authors report a case of arteriolar retinal macrovessel, diagnosed by routine ophthalmologic examination, as well as its optic coherence tomography aspects. Congenital retinal macrovessel is a large aberrant vessel, often unilateral, usually a vein, rarely an artery, located in the posterior pole which can cross t...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492007000100031

    authors: Silva Bde M,Rosa AA,Santos EM,Almeida Sobrinho EF

    更新日期:2007-01-01 00:00:00

  • Long term follow-up of acute multifocal hemorrhagic retinal vasculitis (Blumenkranz syndrome): case report.

    abstract:PURPOSE:To report a 16-year long-term follow-up of a patient with acute multifocal hemorrhagic retinal vasculitis (Blumenkranz syndrome). A 21-year old male was seen in 1994 with acute multifocal hemorrhagic retinal vasculitis (Blumenkranz syndrome), first in the left eye, and later in the right eye. He was treated wit...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492011000500013

    authors: Amaro MH,Roller AB,Motta CT,Motta MM

    更新日期:2011-09-01 00:00:00

  • Sebaceous carcinoma of the eyelid - different diagnostic times, different outcomes: case reports.

    abstract::Sebaceous carcinoma of the eyelid is a very rare slow-growing tumor and is considered an aggressive eyelid neoplasm. It can reach mortality rate of about 6%. Diagnosis is often delayed because of its ability to masquerade as other periocular lesions, both clinically and histologically. We present three cases of sebace...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492011000600013

    authors: Vianna LM,Cariello AJ,Lowen MS,Sant'Anna AE,Hofling-Lima AL

    更新日期:2011-11-01 00:00:00

  • [Electroretinographic study of chromatic vision].

    abstract:PURPOSE:To describe the electroretinogram of the South-American opossum (Didelphis aurita) obtained by chromatic stimulus of specific wavelengths. The electroretinogram records voltage variations of retinal cells triggered by light stimulation. The electroretinogram represents the combination of electric activity of ma...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492006000600014

    authors: Cunha DC,Hokoç JN,Dantas AM,Moraes Junior HV,Moraes AM

    更新日期:2006-11-01 00:00:00

  • Factors affecting the variability of the Heidelberg Retina Tomograph III measurements in newly diagnosed glaucoma patients.

    abstract:PURPOSE:To determine factors associated with the test-retest variability of optic nerve head (ONH) topography measurements with confocal scanning laser ophthalmoscopy (CSLO) in newly diagnosed glaucomatous patients. METHODS:Consecutive patients with newly diagnosed primary open-angle glaucoma were prospectively enroll...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492010000400011

    authors: Prata TS,Meira-Freitas D,Lima VC,Guedes LM,Magalhães FP,Paranhos Junior A

    更新日期:2010-07-01 00:00:00

  • Corneal biomechanical evaluation in healthy thin corneas compared with matched keratoconus cases.

    abstract:PURPOSE:To evaluate and compare corneal hysteresis (CH) and corneal resistance factor (CRF) in healthy eyes with a central corneal thickness (CCT) < 505 µm with CH and CRF in gender-, age-, and CCT-matched keratoconus cases, and to estimate the sensitivity and specificity of these parameters for discriminating between ...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492011000100003

    authors: Fontes BM,Ambrósio R Jr,Velarde GC,Nosé W

    更新日期:2011-01-01 00:00:00

  • Ocular biometry and central corneal thickness in children: a hospital-based study.

    abstract:PURPOSE:To investigate the distribution of axial length, anterior chamber depth, lens thickness, vitreous chamber depth, and central corneal thickness in children at different age groups. METHODS:We studied 364 eyes in 182 children with ages between 1 and 12 years. Axial length, anterior chamber depth, lens thickness,...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20140039

    authors: Gul A,Caglar C,Cınal A,Yasar T,Kılıc A

    更新日期:2014-05-01 00:00:00

  • Topical mitomycin in endoscopic-assisted probing for the treatment of congenital nasolacrimal duct obstruction in older children.

    abstract:PURPOSE:Mitomycin C has been used in ophthalmic surgery to mitigate postoperative scarring. However, the outcomes of endoscopic-assisted probing for the treatment of congenital nasolacrimal duct obstruction with adjunctive mitomycin C in children remain unknown. Our study was aimed to evaluate the efficacy and safety o...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20200062

    authors: Galindo-Ferreiro A,Khandekar R,Akaishi PM,Cruz AAV,Galvez-Ruiz A,Dolmetsch A,Schellini SA

    更新日期:2020-06-01 00:00:00

  • [Waardenburg syndrome type I: case report].

    abstract::Waardenburg syndrome (WS) type I is a non-progressive auditory-pigmentary disorder comprising congenital sensorineural hearing loss and pigmentary disturbances of the iris, hair, and skin, along with dystopia canthorum (lateral displacement of the inner canthi). Affected individuals may have higher risk of: neural tub...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492011000300013

    authors: Silva PC,Rangel P,Couto A Jr

    更新日期:2011-05-01 00:00:00

  • [Treatment of acute retinal necrosis: systematic review].

    abstract:PURPOSE:The purpose of this study was to identify, according to an systematic review, the best treatment for acute retinal necrosis. METHODS:Following the methodologic guidance of the Cochrane Collaboration and its editorial subgroup "Eye and Vision Group", using search strategy for study identification, articles abou...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章,评审

    doi:10.1590/s0004-27492005000400009

    authors: Zajdenweber ME,Muccioli C

    更新日期:2005-07-01 00:00:00

  • Impression cytology features of conjunctival nevi reported as more noticeable.

    abstract:PURPOSE:To report the impression cytology features of conjunctival nevi reported as more noticeable. METHODS:35 patients who reported that a conjunctival lesion had become more noticeable after color or size change were enrolled. On slit-lamp examination, a clinical diagnosis of nevus was made and lesions underwent im...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.1590/s0004-27492009000200014

    authors: Barros Jde N,Lowen MS,Mascaro VL,Andrade TP,Martins MC

    更新日期:2009-03-01 00:00:00

  • Impression cytologic analysis after corneal cross-linking and insertion of corneal ring segments for keratoconus: two-year results.

    abstract:PURPOSE:To report the impression cytologic results after corneal cross-linking and insertion of intrastromal corneal ring segments for keratoconus. METHODS:Thirty-nine eyes were distributed into two groups: 1) cross-linking group (patients underwent corneal cross-linking procedure), and 2) riboflavin eyedrops group (p...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章,随机对照试验

    doi:10.1590/s0004-27492012000200006

    authors: Renesto Ada C,Barros Jde N,Campos M

    更新日期:2012-03-01 00:00:00

  • In vivo ultrathin Descemet stripping automated endothelial keratoplasty with a low-energy and high-frequency femtosecond laser.

    abstract::This case report describes the production of an ultrathin endothelial donor corneal lamella using a femtosecond laser with low energy and a high frequency. In addition, we report its use in vivo in an eye with pseudophakic bullous keratopathy. The outcomes were observed 3 months after surgery in terms of the change in...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20140031

    authors: Victor G,Nosé W,Sousa SJ,Forseto Ados S,Alves MR

    更新日期:2014-04-01 00:00:00

  • Case report: pneumatic retinopexy for the treatment of progressive retinal detachment in senile retinoschisis.

    abstract::Retinoschisis is an abnormal separation of the retinal layers and is asymptomatic in most cases. Enlargement of the area of retinoschisis and retinal tear and detachment are possible complications of the disease, and the treatment of retinoschisis is controversial. In this case report, we present a case of retinal det...

    journal_title:Arquivos brasileiros de oftalmologia

    pub_type: 杂志文章

    doi:10.5935/0004-2749.20150014

    authors: Suzuki AC,Zacharias LC,Tanaka T,Rocha DN,Takahashi WY

    更新日期:2015-01-01 00:00:00