scholarly journals The Relationship between Anterior Chamber Angle and Intraocular Pressure Early after V4c Implantable Collamer Lens Implantation

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Zongli Hu ◽  
Chunlin Chen ◽  
Min Sun ◽  
Rongdi Yuan ◽  
Jian Ye
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Linear Correlation ◽  
Control Group ◽  
Anterior Chamber Angle ◽  
Implantable Collamer Lens ◽  
Significant Difference ◽  
The Right ◽  
The Relationship ◽  
Chamber Angle

Purpose. To confirm the relationship between anterior chamber angle (ACA) and intraocular pressure (IOP) early after V4c implantable collamer lens (ICL) implantation. Methods. Patients were assigned to two groups: (1) right eyes (control group) and (2) left eyes (experimental group), with miosis conducted immediately after ICL implantation in the left eyes. IOP, angle opening distance (AOD), trabecular-iris angle (TIA), and pupil diameter (PD) were compared between two groups at postoperative hours 1, 2, and 24. The relationship between ACA, PD, and IOP was analyzed by multiple linear regression. Result. Thirty-six eyes of 18 patients were enrolled. The prevalence of ocular hypertension (OHT, defined as IOP ≥ 21 mmHg) was 61.11% and 16.67% in the right and left eyes, respectively, (χ2 = 7.481, p=0.006). At postoperative hours 1 and 2, IOP and PD were significantly higher p<0.001 in the right eyes, and TIA and AOD were significantly lower p<0.05 in the right eyes than in the left eyes. There was no significant difference at 24 h postoperative in these parameters. After the right eye ICL implantation, the changes of AOD 500 and PD were both linearly correlated with postoperative IOP change (β = −23.707 and 1.731, respectively; p = 0.013 and 0.002, respectively). Conclusion. The ACA was significantly narrowed immediately after V4c ICL implantation. There was a negative linear correlation between ACA and early IOP and a positive linear correlation between PD and early IOP. We recommend the use of intracameral miotics immediately after V4c ICL implantation to reduce the incidence of IOP spikes.

scholarly journals Anterior Chamber Angle Evaluation following Phakic Posterior Chamber Collamer Lens with CentraFLOW and Its Correlation with ICL Vault and Intraocular Pressure

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Sherif A. Eissa ◽  
Sherin H. Sadek ◽  
Mohamed W. A. El-Deeb
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Refractive Error ◽  
Case Series ◽  
Mean Value ◽  
Posterior Chamber ◽  
Anterior Chamber Angle ◽  
Implantable Collamer Lens ◽  
Angle Width ◽  
Chamber Angle

Purpose.To assess intraocular pressure (IOP), lens vaulting, and anterior chamber (AC) angle width, following V4C implantable Collamer lens (ICL) procedure for myopic refractive error.Methods.A prospective case series that enrolled 54 eyes of 27 patients that were evaluated before and after V4C phakic posterior chamber Collamer lens implantation for correction of myopic refractive error. Preoperative measurement of IOP was done using Goldmann applanation tonometer and anterior chamber angle width using both Van Herick slit lamp grading system and Scheimpflug tomography imaging (Oculus Pentacam). Follow-up of the aforementioned variables was at 1, 6, and 18 months postoperatively, together with ICL vault measurements.Results.The mean baseline IOP of11.69±2.15showed a statistically significant (P=0.002) increase after 1 month that remained unchanged at 6 and 18 months postoperatively, with mean value of16.07±4.12,16.07±4.10, and16.07±4.13, respectively. Pentacam AC angle width showed a statistically significant decrease at 1(P=0.025), 6(P=0.016), and 18(P=0.010)months postoperatively, with mean preoperative value of40.14±5.49that decreased to25.28±5.33,25.46±5.44, and25.49±5.38, at 1, 6, and 18 months, respectively. Mean ICL vault showed moderate correlation with Pentacam AC angle width at 1(r=-0.435)and 6(r=-0.424)months.Conclusion. V4C ICL implantation resulted in decrease in AC angle width and increase in IOP, within acceptable physiological values at all time points.

scholarly journals Assessment of anterior chamber angle changes after phacoemulsification with swept-source OCT

2021 ◽  
Vol 14 (10) ◽  
pp. 1527-1532
Author(s):  
Qian Zheng ◽  
◽  
Zhang-Liang Li ◽  
Ping-Jun Chang ◽  
Yun-E Zhao ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Cataract Surgery ◽  
Anterior Chamber ◽  
Anterior Chamber Depth ◽  
Anterior Chamber Angle ◽  
Swept Source ◽  
Narrow Angle ◽  
Significant Difference ◽  
Shallow Anterior Chamber ◽  
Chamber Angle

AIM: To assess the changes of anterior chamber angle in patients with shallow anterior chamber after phacoemulsification combined with intraocular lens (IOL) implantation, based on anterior segment swept-source optical coherence tomography (AS-SS-OCT) measurements. METHODS: This was a prospective case control study; sixty eyes of sixty case were scheduled for cataract surgery with normal intraocular pressure (IOP). Based on anterior chamber depth (ACD) and gonioscopy findings, the eyes were divided into two groups: group of shallow anterior chamber and narrow angle (SAC group, 30 eyes); and group of normal anterior chamber group with wide angle (NAC group, 30 eyes). Measurements of ACD, anterior chamber volume (ACV), iris volume (IV), lens vault (LV), angle opening distance (AOD), angle recess area (ARA), trabecular iris space area (TISA), and trabecular iris angle (TIA) were conducted in each group before and 3mo after surgery. RESULTS: There was no significant difference in age, axial length (AL), corneal curvature, corneal diameter, intraocular pressure, and IV between two groups before surgery, except for the LV (P=0.000). ACD and ACV were prominently larger in the NAC group than the SAC group 3mo after operation (3.69±0.38 vs 3.85±0.39 mm, P=0.025; 161.37±19.47 vs 178.26±20.30 mm3, P=0.002). AOD750, ARA750 in nasal and inferior quadrants, TISA750 in all quadrants except temporal, and TIA750 in all quadrants in SAC group were significantly smaller than those in NAC group after operation (all P<0.05). CONCLUSION: Cataract surgery can deepen anterior chamber and increase the width of anterior chamber angle in Chinese subjects, but the angle related parameters including AOD750, ARA750, TISA750, TIA, TISA750, and ACV in patients with shallow anterior chamber and narrow angle do not reach the normal level.

Evaluation of Biomechanically Corrected Intraocular Pressure Measurements in Keratoconus and Forme Fruste Keratoconus

2020 ◽  
Vol 63 (6) ◽  
pp. 541-549
Author(s):  
Tomoya Nishida ◽  
Takashi Kojima ◽  
Takahiro Kataoka ◽  
Naoki Isogai ◽  
Yoko Yoshida ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Biomechanical Properties ◽  
Control Group ◽  
Pressure Measurements ◽  
Altman Plot ◽  
Significant Difference ◽  
The Difference ◽  
The Right ◽  
Corneal Biomechanical Properties ◽  
Forme Fruste Keratoconus

<b><i>Introduction:</i></b> Although biomechanically corrected intraocular pressure (bIOP) is available, the effectiveness of intraocular pressure (IOP) correction in keratoconus and forme fruste keratoconus (FFK) eyes has not been investigated. <b><i>Objective:</i></b> Evaluation of bIOP measurements in eyes with keratoconus and FFK. <b><i>Methods:</i></b> Forty-two eyes in 21 patients with keratoconus in one eye and FFK in the fellow eye were examined (KC/FFK group; mean age 24.62 ± 8.6 years; 16 males and 5 females). The control group consisted of 62 eyes in 31 unaffected subjects (mean age 26.26 ± 3.64 years; 15 males and 16 females). The bIOP was determined using a Scheimpflug-based tonometer (Corvis Scheimpflug Technology [Corvis ST®]) after measuring the IOP with a conventional non-contact tonometer (NIOP). The agreement between NIOP and bIOP values was examined using the Bland-Altman plot. The difference between NIOP and bIOP (bIOP correction amount) was compared between keratoconus and FFK eyes. <b><i>Results:</i></b> In the control group, there were no significant differences between right and left eyes in both NIOP and bIOP values (<i>p</i> = 0.975 and <i>p</i> = 0.224, respectively). In the KC/FFK group, NIOP values were significantly lower in the keratoconus eyes (9.93 ± 1.96 mm Hg) than in the FFK eyes (12.23 ± 3.03 mm Hg; <i>p</i> = 0.0003). There was no significant difference in bIOP values between the right and left eyes of the KC/FFK group (<i>p</i> = 0.168). The bIOP correction amount was significantly increased in keratoconus eyes (3.58 ± 2.12 mm Hg) compared to in FFK eyes (1.80 ± 3.32 mm Hg; <i>p</i> = 0.011). <b><i>Conclusions:</i></b> For eyes with keratoconus and FFK, the bIOP method is effective to adjust IOP measurements based on corneal biomechanical properties.

Changes in intraocular pressure and anterior chamber angle after congenital cataract extraction

2019 ◽  
Vol 23 (4) ◽  
pp. e30-e31 ◽  
Author(s):  
Jylan Gouda ◽  
Abdelrahman Elhusseiny ◽  
Reham H. Tomairek ◽  
Dina Elfayoumi ◽  
Ahmed Awadein ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Congenital Cataract ◽  
Cataract Extraction ◽  
Anterior Chamber Angle ◽  
Chamber Angle

scholarly journals The changes of anatomic and topographic characteristics of eye anterior segment after uncomplicated cataract phacoemulsification

2013 ◽  
Vol 94 (6) ◽  
pp. 853-858
Author(s):  
A A Ryabtseva ◽  
M P Yugaj ◽  
N S Nikitina
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Ultrasound Biomicroscopy ◽  
Anterior Chamber Angle ◽  
Ciliary Processes ◽  
Lens Implantation ◽  
Topographic Characteristics ◽  
Chamber Angle

Aim. To study the changes of anatomic and topographic characteristics of the eye anterior segment after uncomplicated cataract phacoemulsification using corneal incision with intraocular soft lens implantation. Methods. The data of ultrasound biomicroscopy and noncontact tonometry of 58 eyes (56 patients, 32 females, 24 males aged 54 to 78 years) before and after cataract phacoemulsification were analyzed. Paitents with survived ocular trauma, refractive keratoplasty, glaucoma, uveitis, and surgical complications (incomplete capsulorrhexis, posterior capsule rupture, ciliary zonule disinsertion, corneal burn). Apart from the common examinations (visual acuity testing, tonometry, tonography, eye A- and B-ultrasonography, biomicroscopy), all patients underwent eye ultrasound biomicroscopy. Results. Anterior chamber depth increased from 2.73±0.10 to 4.17±0.06 mm (p ≤0.001). Trabecula-iris distance measured at 500 μm from the scleral spur, increased from 0.38±0.02 to 0.47±0.02 mm (p ≤0.001). Anterior chamber angle increased from 28.69±1.87 to 42.73±1.56 degrees (p ≤0.001), the angle between the iris and the sclera increased from 32.78±1.39 to 41.36±0.84 degrees (p ≤0.001), the angle between the sclera and ciliary processes increased from 39.48±1.29 to 45.30±1.16 degrees (p ≤0.001). Intraocular pressure according to the non-contact tonometry data decreased from 18.16±1.29 to 13.55±0.95 mm Hg (p ≤0.001). Conclusion. Anterior chamber depth, trabecula-iris distance, anterior chamber angle, the angle between sclera and iris and the angle between sclera and ciliary processes increased significantly after phacoemulsification with intraocular lens implantation. Intraocular pressure decreased significantly according to the non-contact tonometry data.

Understanding Trabecular Meshwork Physiology: A Key to the Control of Intraocular Pressure?

Physiology ◽  
2003 ◽  
Vol 18 (5) ◽  
pp. 205-209 ◽  
Author(s):  
Artur Llobet ◽  
Xavier Gasull ◽  
Arcadi Gual
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Aqueous Humor ◽  
Trabecular Meshwork ◽  
Anterior Chamber Angle ◽  
Chamber Angle

The trabecular meshwork is a tissue located in the anterior chamber angle of the eye, and it is a crucial determinant of intraocular pressure values because of its resistance to the evacuation of aqueous humor from the eye. Here we bring together classical and recent discoveries on the function of the trabecular meshwork, keys to understanding eye pathophysiology.

Anterior Chamber Angle and Iris-Lens Contact Alteration During Pupillary Dilation

2011 ◽  
Author(s):  
Sara Jouzdani ◽  
Rouzbeh Amini ◽  
Victor H. Barocas
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Aqueous Humor ◽  
Ciliary Body ◽  
Ocular Tissue ◽  
Posterior Chamber ◽  
Pupillary Dilation ◽  
Anterior Chamber Angle ◽  
Aqueous Outflow ◽  
Chamber Angle

The aqueous humor (AH) provides oxygen and nutrients for the avascular ocular tissue specifically, the cornea and lens. AH is secreted by the ciliary body into the posterior chamber, passes through pupil, and drains into the anterior chamber (Fig. 1a). Resistance to the aqueous outflow generates the intraocular pressure (IOP), which is 15–20 mmHg in the normal eyes.

scholarly journals Anatomic features of anterior chamber angle in children with glaucoma depending on the degree of the cicatricial retinopathy of prematurity

2019 ◽  
Vol 12 (1) ◽  
pp. 21-26
Author(s):  
Maria A. Makarova ◽  
Viktoria M. Panchishena ◽  
Elena V. Brusakova ◽  
Regina V. Ershova ◽  
Elvira I. Saidasheva ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Retinopathy Of Prematurity ◽  
Full Term ◽  
Congenital Glaucoma ◽  
Control Group ◽  
Study Group ◽  
Anterior Chamber Angle ◽  
Anatomic Structure ◽  
Preterm Children ◽  
Chamber Angle

Introduction. The retinopathy of prematurity (ROP) is a leading condition in the nosological structure of ophthalmic pathology in preterm children. A number of researchers note the increase in frequency of glaucoma development in such patients, considerably worsening the prognosis of the disease. At the same time, features of ocular hydrostatics and hydrodynamics taking into account the immaturity of the eye are studied insufficiently. The purpose of the study was to estimate the anterior chamber angle anatomy in preterm children with glaucoma depending on the cicatricial ROP severity. Materials and methods. The study group included 45 preterm children (87 eyes) aged from 6 months to 18 years with glaucoma on the background of cicatricial ROP. The control group consisted of 27 full-term children (54 eyes) with congenital glaucoma. As an addition to traditional ophthalmologic examination, iridocorneal goniography using a pediatric retinal camera was performed. Results. In children of the study group, anomalies of anterior chamber angle anatomic structure were diagnosed in the absolute majority of cases 97.7% of cases (85 eyes) and depended on the cicatricial ROP severity: at degrees 1-3 they were similar to those in congenital glaucoma in full-term children; at degrees 4-5 glaucoma was of secondary nature and developed as a result of a combination of dysgenesis signs in the anterior chamber angle. Conclusion. Cicatricial ROP of any degree is a high risk factor for the development of secondary glaucoma.

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