Presbyopia:Effectiveness of correction strategies

Presbyopia is a global problem affecting over a billion people worldwide. The prevalence of unmanaged presbyopia is as high as 50% of those over 50 years of age in developing world populations due to a lack of awareness and accessibility to affordable treatment, and is even as high as 34% in developed countries. Definitions of presbyopia are inconsistent and varied, so we propose a redefinition that states “presbyopia occurs when the physiologically normal age-related reduction in the eye's focusing range reaches a point, when optimally corrected for distance vision, that the clarity of vision at near is insufficient to satisfy an individual's requirements”. Presbyopia is inevitable if one lives long enough, but intrinsic and extrinsic risk factors including cigarette smoking, pregnancy history, hyperopic or astigmatic refractive error, ultraviolet radiation, female sex (although accommodation is similar to males), hotter climates and some medical conditions such as diabetes can accelerate the onset of presbyopic symptoms. Whilst clinicians can ameliorate the symptoms of presbyopia with near vision spectacle correction, bifocal and progressive spectacle lenses, monovision, translating or multifocal contact lenses, monovision, extended depth of focus, multifocal (refractive, diffractive and asymmetric designs) or ‘accommodating’ intraocular lenses, corneal inlays, scleral expansion, laser refractive surgery (corneal monovision, corneal shrinkage, corneal multifocal profiles and lenticular softening), pharmacologic agents, and electro-stimulation of the ciliary muscle, none fully overcome presbyopia in all patients. While the restoration of natural accommodation or an equivalent remains elusive, guidance is gives on presbyopic correction evaluation techniques

A practical alternative to calculating unmet need for family planning

Irit Sinai,1,2 Susan Igras,1 Rebecka Lundgren1 1Institute for Reproductive Health, Georgetown University, Washington, DC, USA; 2Palladium, Washington, DC, USA Abstract: The standard approach for measuring unmet need for family planning calculates actual, physiological unmet need and is useful for tracking changes at the population level. We propose to supplement it with an alternate approach that relies on individual perceptions and can improve program design and implementation. The proposed approach categorizes individuals by their perceived need for family planning: real met need (current users of a modern method), perceived met need (current users of a traditional method), real no need, perceived no need (those with a physiological need for family planning who perceive no need), and perceived unmet need (those who realize they have a need but do not use a method). We tested this approach using data from Mali (n=425) and Benin (n=1080). We found that traditional method use was significantly higher in Benin than in Mali, resulting in different perceptions of unmet need in the two countries. In Mali, perceived unmet need was much higher. In Benin, perceived unmet need was low because women believed (incorrectly) that they were protected from pregnancy. Perceived no need – women who believed that they could not become pregnant despite the fact that they were fecund and sexually active – was quite high in both countries. We posit that interventions that address perceptions of unmet need, in addition to physiological risk of pregnancy, will more likely be effective in changing behavior. The suggested approach for calculating unmet need supplements the standard calculations and is helpful for designing programs to better address women’s and men’s individual needs in diverse contexts. Keywords: unmet need, family planning, contraception, Mali, Beni

Men’s social networks, social norms, & family planning in Benin

To address low family planning (FP) use and high unmet need in West Africa, attention has been paid to addressing FP-related social networks and norms. Most work focuses on women. This analysis assesses men’s FP-related social networks and norms and their relation to FP use in Benin using data from baseline surveys from the Tékponon Jikuagou intervention. We descriptively analysed men’s egocentric FP-related social networks and norms at the village level. Multivariable logistic regression analyses (N = 885) examined the relationship between FP-related social networks, norms, and men’s current and future FP use. Twenty-three percent of men reported current modern contraception use and 47% reported intended future use. Most had few network members. While most believed it was acceptable to discuss FP, few talked with peers about FP and most did not discuss FP with their partner(s). In multivariable analyses, neither networks nor norms were significantly related to men’s FP use. Men’s networks being small and men rarely discussing FP indicate an opportunity for village-based approaches to engage men in FP discussions and spark FP dialogue within couples, between men, and within villages. Future work should further explore the relationship between men’s social networks, norms, and FP use

Production technology of nitrogen-sulphur-calcium fertilizers on the base of urea and phosphogypsum

Przeprowadzono badania nad możliwością otrzymywania granulowanych nawozów typu adduktu siarczanu wapnia i mocznika na drodze granulacji pulpy mocznikowo-fosfogipsowej. Zbadano wpływ różnych dodatków na wytrzymałość granul tego typu nawozów. Stwierdzono, że dodatek siarczanu magnezu, stosowanego w różnych formach, zwiększa wytrzymałość granulatów. Wzrost wytrzymałości powoduje także dodatek bentonitu. Przydatność rolnicza nawozu została sprawdzona w rolniczych doświadczeniach polowych.Studies on preparation possibility of granular fertilizers of calcium sulfate and urea adduct type by granulation of urea-phosphogypsum pulp were carried out. The effect of various additives on granule hardness of this type fertilizers was investigated. It was found that addition of magnesium sulfate in various forms increased the granule mechanical strength. Bentonite addition also increased hardness of granules. Agricultural usefulness of the fertilizers was confirmed in field tests