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We investigated the antioxidant effects of vitamin E on a glucocorticoid (GC) induced model of cataracts in chick embryos. We used 70 fertilized eggs divided into seven groups as follows: phosphate-buffered saline (PBS) group, olive oil treatment (OO) group, hydrocortisone treatment (HC) group, olive oil and hydrocortisone treatment (OO + HC) group, 50 mg/kg vitamin E and hydrocortisone treatment (HC + VE (50)) group, 25 mg/kg vitamin E and hydrocortisone treatment (HC + VE (25)) group and 15 mg/kg vitamin E and hydrocortisone treatment (HC + VE (15)) group. On day 17, chick embryos were removed from the eggs and lens and liver tissues were excised. Cataract formation was evaluated and total antioxidant status (TAS), total oxidant status (TOS), malondialdehyde (MDA) and glutathione peroxidase (GPx) were measured in lens and liver tissues; MDA was measured only in liver. The lenses in the HC + VE (50) group exhibited significantly higher levels of GPx and TAS, and lower levels of TOS than for HC and OO + HC groups. The livers of the HC + VE (50) group exhibited significantly higher levels of GPx and lower levels of MDA than for the HC and OO + HC groups. The HC + VE (50) group lenses were evaluated as grade 1, because the nuclei were completely free of cataracts, likely due to the antioxidative effect of high dose VE. VE is an effective antioxidant agent that exhibits a dose-response effect, for ameliorating the negative effects of GCs.

Background: The purpose of this study was to report the effects of smoking on retinal vascular parameters., Methods: In this cross-sectional study design, 24 smokers were included as a study group and 26 age- and sex-matched non-smokers as a control group. A detailed ophthalmic examination including review of medical history, visual acuity testing, intraocular pressure measurement by Goldmann applanation tonometry, ocular movement and pupillary reflex examination, slitlamp biomicroscopy as well as dilated funduscopic examination were undertaken in all participants. Participants underwent optical coherence tomography angiography (OCT-A) scanning with RTVue XR Avanti AngioVue OCT-A (Optovue, Fremont, CA, USA) as well as the measurement of axial length using an AL Scan (Nidek Co., Ltd., Gamagori, Japan)., Results: The study comprised of 18 men and six women with a mean age of 28.1 ± 4.8 years in the study group and 19 men and seven women with a mean age of 27.4 ± 2.7 years in the control group. The mean exposure to cigarette smoking was 3.3 ± 1.0 pack-years. Total vascular density, parafoveal vascular density and perifoveal vascular density in the deep capillary plexus observed with OCT-A were significantly lower in the smoking group compared to the control group (p = 0.02, 0.01 and 0.01, respectively)., Conclusion: Retinal vascular changes caused by cigarette smoking may occur even at low pack-year exposure. These changes, which can be demonstrated by OCT-A, may reflect the early impact of cigarette smoking on the microvascular system., (© 2020 Optometry Australia.)