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The selection of different suppliers, different raw materials, and different transportation options all have an impact on costs, so it is important to measure and consider these factors to keep costs as low as possible. In this paper, we use the TOPSIS model to analyze the 240-week order quantity and the supplier's supply quantity to evaluate the supplier's fulfillment and to determine the most important supply for the optimal solution of material ordering and transportation. An objective function optimization model is applied to ensure that the inventory is kept at least two weeks to meet the production demand, so that the purchase price is the most economical, the depletion rate is the least, and the storage cost is the lowest, and finally the optimal ordering and transportation solution is programmed and analyzed.

PurposeTo investigate whether quantitative optical coherence tomography angiography (OCTA) metrics of the superficial/deep macular retina are associated with the development of visual field (VF) loss in the fellow eyes of normal tension glaucoma (NTG) patients with unilateral VF loss.MethodsA longitudinal study was conducted in which 61 eyes with normal VF (mean VF mean deviation −0.7±1.6 dB) from 61 NTG patients were included. All subjects underwent OCTA imaging, spectral-domain-OCT imaging and VF testing. OCTA metrics of superficial capillary plexus and deep capillary plexus (DCP) in the macular region were measured. Relationships between baseline OCTA metrics, demographics and ocular characteristics and the risk of VF glaucoma progression were analysed with a Cox proportional hazards model.ResultsDuring a mean follow-up of 38 months, 11 fellow eyes (18.0%) with normal VF at baseline were determined to have VF progression, while 21.3% of affected eyes had VF progression. After adjustment for potential confounding factors, decreased baseline DCP in the fellow eyes was significantly associated with future VF progression (HR 1.33, 95% CI 1.03 to 1.73, p=0.031).ConclusionDecreased DCP was associated with a higher risk of developing VF damage in NTG patients with unilateral VF loss. Assessments of DCP may help improve the evaluation of the risk of functional deterioration in fellow eyes with an initially normal VF.