Changes in Anterior Segment Parameters Following Pars Plana Vitrectomy Measured by Ultrasound Biomicroscopy (UBM)



Despite being a posterior segment ocular surgery, pars plana vitrectomy (PPV) may also affect anterior segment parameters. We aimed to investigate anterior segment alterations following PPV using ultrasound biomicroscopy (UBM) to visualize the structural anatomy of the eye.

In this study, we enrolled phakic patients undergoing PPV (as the sole procedure). The anterior chamber depth, crystalline lens anterior-posterior (AP) diameter, anterior chamber angle, ciliary body dimensions, and integrity of the ciliary zonules and posterior capsule were assessed using UBM before and at least 3 months after PPV. Seven eyes from seven patients were included in the study. The indications for PPV were rhegmatogenous retinal detachment (57%), epiretinal membrane (29%), and macular hole (14%). The mean age of the patients was 57.86 ± 6.56 years, and they were followed up for a mean of 131.57 ± 29.99 days.

The crystalline lens AP diameter was the only parameter that changed significantly following PPV (p = 0.042). Thus, increases in the crystalline lens AP diameter, without significant changes in the anterior chamber depth, can be expected after PPV due to the development of nuclear sclerotic cataracts.


Chang MA, Parides MK, Chang S, Braunstein RE. Outcome of phacoemulsification after pars plana vitrectomy. Ophthalmology. 2002 May;109(5):948-54. PMID: 11986103.

Gupta OP, Weichel ED, Regillo CD, Fineman MS, Kaiser RS, Ho AC, McNamara JA, Vander JE. Postoperative complications associated with 25-gauge pars plana vitrectomy. Ophthalmic Surg Lasers Imaging. 2007 Jul-Aug;38(4):270-5. PMID: 17674916.

Chung CP, Hsu SY, Wu WC. Cataract formation after pars plana vitrectomy. Kaohsiung J Med Sci. 2001 Feb;17(2):84-9. PMID: 11416962.

Melberg NS, Thomas MA. Nuclear sclerotic cataract after vitrectomy in patients younger than 50 years of age. Ophthalmology. 1995 Oct;102(10):1466-71. PMID: 9097793.

Yanyali A, Horozoglu F, Celik E, Nohutcu AF. Long-term outcomes of pars plana vitrectomy with internal limiting membrane removal in diabetic macular edema. Retina. 2007 Jun;27(5):557-66. PMID: 17558316.

Hsuan JD, Brown NA, Bron AJ, Patel CK, Rosen PH. Posterior subcapsular and nuclear cataract after vitrectomy. J Cataract Refract Surg. 2001 Mar;27(3):437-44. PMID: 11255058.

Grusha YO, Masket S, Miller KM. Phacoemulsification and lens implantation after pars plana vitrectomy. Ophthalmology. 1998 Feb 1;105(2):287-94.

Simcock PR. Phacoemulsification and intraocular lens implantation following pars plana vitrectomy: a prospective study. Eye (Lond). 2005 Apr;19(4):480. PMID: 15543193.

Braunstein RE, Airiani S. Cataract surgery results after pars plana vitrectomy. Curr Opin Ophthalmol. 2003 Jun;14(3):150-4. Review. PMID: 12777934.

Dada T, Sihota R, Gadia R, Aggarwal A, Mandal S, Gupta V. Comparison of anterior segment optical coherence tomography and ultrasound biomicroscopy for assessment of the anterior segment. J Cataract Refract Surg. 2007 May;33(5):837-40. PMID: 17466858.

Pavlin CJ, Foster FS. Ultrasound biomicroscopy: high-frequency ultrasound imaging of the eye at microscopic resolution. Radiologic Clinics of North America. 1998 Nov 1;36(6):1047-58.

Pavlin CJ, Harasiewicz K, Sherar MD, Foster FS. Clinical use of ultrasound biomicroscopy. Ophthalmology. 1991 Mar;98(3):287-95. PMID: 2023747.

Pavlin CJ, Buys YM, Pathmanathan T. Imaging zonular abnormalities using ultrasound biomicroscopy. Arch Ophthalmol. 1998 Jul;116(7):854-7. PMID: 9682697.

Tello C, Liebmann J, Potash SD, Cohen H, Ritch R. Measurement of ultrasound biomicroscopy images: intraobserver and interobserver reliability. Invest Ophthalmol Vis Sci. 1994 Aug;35(9):3549-52. PMID: 8056531.

Neudorfer M, Oren N, Barak A. High-frequency ultrasound biomicroscopy of the anterior segment morphometry before and immediately after pars plana vitrectomy. Eur J Ophthalmol. 2011 Mar-Apr;21(2):173-8. PMID: 20563997.

Marigo Fde A, Zisman M, Nehemy MB, Marigo PV. Ultrasound biomicroscopy in the comparison of the anterior segment morphometry before and after pars plana vitrectomy. Arq Bras Oftalmol. 2006 Nov-Dec;69(6):919-22. PMID: 17273689.

Pinter SM, Sugar A. Phacoemulsification in eyes with past pars plana vitrectomy: case-control study. J Cataract Refract Surg. 1999 Apr;25(4):556-61. PMID: 10198863.

Full Text: Full Text PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.