Effect of Lens Vault on the Accuracy of Intraocular Lens Calculation Formulas in Shallow Anterior Chamber Eyes

2021 ◽  
Author(s):  
Chenxi Yan ◽  
Ke Yao
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Lens Vault ◽  
Shallow Anterior Chamber ◽  
Intraocular Lens Calculation

scholarly journals Effect of anterior chamber depth on the choice of intraocular lens calculation formula in patients with normal axial length

2014 ◽  
Vol 21 (4) ◽  
pp. 307 ◽  
Author(s):  
Hassan Hashemi ◽  
Mehdi Khabazkhoob ◽  
Farhad Rezvan ◽  
Akbar Fotouhi ◽  
Soheila Asgari ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Calculation Formula ◽  
Intraocular Lens Calculation

scholarly journals Progress in Modern Cataract Surgery – New Steps and Algorithms for Precise Measuring and Intraocular-lens Calculations

2017 ◽  
Vol 11 (02) ◽  
pp. 95
Author(s):  
Fritz H Hengerer ◽  
Gerd U Auffarth ◽  
Ina Conrad-Hengerer ◽  
◽  
◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Intraocular Lens ◽  
Axial Length ◽  
Refractive Surgery ◽  
Anterior Chamber Depth ◽  
Corneal Surface ◽  
Intraocular Lens Calculations ◽  
Target Refraction ◽  
Intraocular Lens Calculation

In standard cataract surgery, one of the major goals is to reach target refraction. Based on keratometry measurements, axial length and anterior chamber depth, most of the intraocular lens calculation formulae are suitable to achieve this aim. Further evaluation of corneal refractive parameters like anterior and posterior corneal surface by Scheimpflug devices led to a significant enhancement of precision in astigmatic and post-refractive surgery cases.

scholarly journals Ex-PRESS shunt implantation for intractable glaucoma with posterior chamber phakic intraocular lens: a case report

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Rongrong Hu ◽  
Wei Xu ◽  
Baishuang Huang ◽  
Xiaoyu Wang
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
High Myopia ◽  
Posterior Chamber ◽  
Filtration Surgery ◽  
Phakic Intraocular Lens ◽  
Glaucoma Filtration Surgery ◽  
Shallow Anterior Chamber ◽  
The Right ◽  
Intractable Glaucoma

Abstract Background Implantation of the posterior chamber phakic intraocular lens has been widely performed to correct high and extreme myopia. Chronic intraocular pressure (IOP) elevation may occur in its late postoperative period. For medically uncontrolled cases, surgical treatment is necessary, and benefits should be weighed against risks when determining whether to remove the lens. Case presentation A 32-year-old man with extremely high myopia presented with progressive blurred vision and medically uncontrolled IOP in the right eye. His past ocular history was significant for bilateral implantable collamer lens (ICL) implantation ten years ago. On ophthalmic examination, the ICL was well placed with a vault height of 456 µm in the right eye. The anterior chamber angles were open but narrow, and mild to moderate trabecular pigmentation was noted. Ex-PRESS glaucoma filtration surgery without ICL removal was performed to control IOP. During surgery, an Ex-PRESS P50 shunt was inserted into the anterior chamber via the front edge of the blue-grey transition zone between the sclera and cornea. Transient hypotony and shallow anterior chamber occurred in the first week after surgery, along with an ICL tilt towards the cornea with reduced vault height. No other complications related to either the ICL or the Ex-PRESS shunt were noted. IOP remained stable at 12 ~ 14 mmHg at the first 3-month follow-up. Conclusions Ex-PRESS glaucoma filtration surgery might be a safe and effective alternative treatment for intractable glaucoma with high myopia and ICL implantation. Careful assessment of the ICL position and anterior chamber angle is necessary to plan the appropriate surgical procedure. A postoperative shallow anterior chamber may result in ICL dislocation.

scholarly journals Complication of foldable single-piece intraocular lens sulcus implantation in a child under two years old

2020 ◽  
Vol 1 (4) ◽  
pp. 295-300
Author(s):  
Julie Dewi Barliana
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Corneal Endothelium ◽  
Inflammatory Process ◽  
Posterior Chamber ◽  
Iol Implantation ◽  
Single Piece ◽  
Shallow Anterior Chamber ◽  
One Year ◽  
Corneal Diameter

A two-and-a-half-year-old boy presented to Cipto Mangunkusumo Hospital, Jakarta, Indonesia with a white spot on his left eye. He had cataract surgery one year prior at another hospital. On examination, corectopia, anterior synechiae, white plaque between the iris and corneal endothelium, a shallow anterior chamber, and an intraocular lens (IOL) in the posterior chamber were found. As a result, anterior chamber reformation and IOL explantation was performed. Intraoperatively, a foldable single-piece IOL was found in the ciliary sulcus. Hence, extreme inflammatory process after the operation was unavoidable. One month after the procedure, the cornea was opaque without an increase in intraocular pressure. It is recommended to perform IOL implantation only in children over two years of age with a corneal diameter more than 9 mm. A three-piece IOL might be implanted in the area of the ciliary sulcus only if the child needs an immediate IOL implant.

Accuracy of 8 intraocular lens calculation formulas in relation to anterior chamber depth in patients with normal axial lengths

2018 ◽  
Vol 44 (3) ◽  
pp. 362-368 ◽  
Author(s):  
Sabite Emine Gökce ◽  
Ildamaris Montes De Oca ◽  
David L. Cooke ◽  
Li Wang ◽  
Douglas D. Koch ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Anterior Chamber Depth ◽  
Intraocular Lens Calculation

scholarly journals Evaluation of Anterior Chamber Depth and Anterior Chamber Angle Changing After Phacoemulsification in the Primary Angle Close Suspect Eyes

2019 ◽  
Vol 7 (24) ◽  
pp. 4297-4300
Author(s):  
Anh Tuan Vu ◽  
Van Anh Bui ◽  
Hai Long Vu ◽  
Do Quyet ◽  
Than Van Thai ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Anterior Chamber Depth ◽  
Angle Closure ◽  
Control Group ◽  
Anterior Chamber Angle ◽  
Interventional Study ◽  
Primary Angle Closure ◽  
Shallow Anterior Chamber ◽  
Chamber Angle

BACKGROUND: Phacoemulsification surgery has the ability to deeply alter the segment anterior morphology, especially in eye with shallow anterior chamber (AC), narrow anterior chamber angle (ACA). However, the changes of anterior chamber depth (ACD) and ACA on the close angle suspect eyes after phacoemulsification have not been mentioned in many studies. So, we conduct this research. AIM: To evaluate the alteration in the ACA and ACD after phacoemulsification in the close angle suspect eyes. METHODS: Interventional study with no control group. Subjects were the primary angle closure suspect (PACS) eyes, that were operated by phacoemulsification with intraocular lens (IOL) at Glaucoma Department of VNIO from December 2017 to October 2018. RESULTS: 29 PACS eyes with cataract were operated by phacoemulsification with intraocular lens. After 3 months of monitoring, the average ACD augmented from 2.082 ± 0.244 to 3.673 ± 0.222 mm. AOD500 increase from 0.183 ± 0.088 to 0.388 ± 0.132 μm, AOD750 increased from 0.278 ± 0.105 to 0.576 ± 0.149 μm. The TISA500 enlarged from 0.068 ± 0.033 to 0.140 ± 0.052 mm2, TISA750 enlarged from 0.125 ± 0.052 to 0.256 ± 0.089 mm2 at the third month (p < 0.01). CONCLUSION: Phacoemulsification surgery increases the ACD and enlarged the angle in the PACS eyes.

Lenstar® LS 900 vs Pentacam®-AXL: Comparative study of ocular biometric measurements and intraocular lens power calculation

2018 ◽  
Vol 28 (6) ◽  
pp. 645-651 ◽  
Author(s):  
Joana Maria Mendes Pereira ◽  
Arminda Neves ◽  
Pedro Alfaiate ◽  
Mónica Santos ◽  
Henrique Aragão ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Axial Length ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
T Test ◽  
Biometric Measurements ◽  
Paired T Test ◽  
Intraocular Lens Calculation

Purpose: Comparison of biometric measurements and calculation of intraocular lens with a new biometer (Pentacam®-AXL, Oculus, Germany) and a reference biometer (Lenstar LS 900®, Haag-Streit AG, Switzerland), in order to assess the agreement between these two devices. Setting: Centro Hospitalar de Leiria, Portugal Materials and methods: Prospective, institutional study, in which measurements of axial length, anterior chamber depth from the corneal epithelium and endothelium to the anterior surface of the lens (anterior chamber depth ext and anterior chamber depth int), central corneal thickness and keratometry readings of the flattest and steepest meridians (K1 and K2) were obtained with the two systems. Intraocular lens calculation was also performed, using the Haigis, SRK/T and HofferQ formulas. Results: The study sample included 136 eyes of 79 patients. Of these, 42 were women and 37 were men. Statistically significant differences were found (p < 0.05, paired T test) in K1, K2 and central corneal thickness between the 2 biometers. Intraocular lens calculation with the Lenstar® and the Pentacam® with Haigis, SRK/T and HofferQ formulas showed statistically significant differences (p < 0.05 Paired T test). Conclusion: Axial length measurements obtained with the Pentacam® and Lenstar® appear to be interchangeable, while measurements of anterior chamber depth, K1 and K2, and central corneal thickness do not appear to be interchangeable between different devices. Statistically significant differences were found in the calculation of intraocular lenses in all formulas used.

Sign in / Sign up

Export Citation Format

Share Document