Abstract
Background: Refractive and ocular biometric changes after silicone oil tamponade (SOT) in phakic eyes have been studied thoroughly; however, similar studies amongst Sudanese patients with vitreoretinal conditions were not carried out.Aim: This study aimed to assess post-operative changes in refraction, corneal power and axial length after pars plana vitrectomy (PPV) with SOT in phakic patients.Setting: The study was conducted at Sudan Eye Center, Khartoum, Sudan.Methods: A cross-sectional retrospective hospital-based study was performed at Sudan Eye Center. The study included all phakic patients who underwent PPV with SOT for a variety of vitreoretinal conditions from October 2018 to January 2019. Clinical investigations included uncorrected visual acuity (VA), best-corrected VA, refraction, corneal power and axial length pre- and post-surgery. Differences in these parameters were assessed using a paired sample t-test with a significance level of 0.05.Results: Medical records of 59 consecutive patients (59 eyes, 41 men and 18 women) with ages ranging from 22 years to 75 years were studied. The findings revealed a statistically significant hypermetropic change (pre: –0.17 ± 2.44 dioptre [D] and post: +4.43 ± 2.04 D) with a p-value of 0.001. In terms of axial length, there was a significant increase (pre: 23.61 ± 1.17 mm and post: 23.82 ± 1.27 mm; p 0.001). However, no significant change was found in corneal power (pre: –43.60 ± 1.96 D and post: 43.63 ± 2.03 D; p = 0.45).Conclusion: A hypermetropic shift in refraction, longer axial length and non-considerable increase in corneal power were observed amongst Sudanese phakic patients after PPV with instillation of silicone oil.
Highlights
The silicone oil (SO) is an effective intraocular tamponade material used in complex vitreoretinal surgeries with a higher refractive index (1.405) in comparison with the vitreous and aqueous humour.[1,2] This oil when injected into the vitreous cavity produces a noticeable alteration in the refractive state of the eye.[2,3] The use of SO as a long-acting retinal tamponade was found to increase the chances of keeping the retina in its position and improving the management of complicated vitreoretinal diseases.[3]
The oil separates from the retina producing a positive posterior surface contributing to myopia, where more effect occurs in aphakic eyes.[3,4,5,6]
The study included 59 participants (59 phakic eyes) who underwent Pars Plana Vitrectomy (PPV) combined with silicone oil tamponade (SOT) for different vitreoretinal conditions in one eye
Summary
The silicone oil (SO) is an effective intraocular tamponade material used in complex vitreoretinal surgeries with a higher refractive index (1.405) in comparison with the vitreous and aqueous humour.[1,2] This oil when injected into the vitreous cavity produces a noticeable alteration in the refractive state of the eye.[2,3] The use of SO as a long-acting retinal tamponade was found to increase the chances of keeping the retina in its position and improving the management of complicated vitreoretinal diseases.[3] Silicone oil has a refractive index slightly higher than that of vitreous, and it causes refractive changes, which are determined by the shape of the anterior surface of the silicone bubble and the positioning of the patient.[3,4] A negative lens effect occurs in the phakic eyes because of the concavity produced by the posterior lens surface. Refractive and ocular biometric changes after silicone oil tamponade (SOT) in phakic eyes have been studied thoroughly; similar studies amongst Sudanese patients with vitreoretinal conditions were not carried out
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