Older people do not use magnifying glass as reading glasses

When people are old, it will inevitably lead to a decline in their eyesight, and they will gradually develop difficulties in reading or working in close quarters. This is presbyopia. Presbyopia is common in older people. How do you see things with presbyopia? Magnifying glass PK reading glasses, which one would you choose? Or what do you want your parents to choose?

Many people think that there is not much difference between the two. In fact, this is a big misunderstanding. Many old people like to use a magnifying glass to read newspapers and books. In fact, this is not good for their eyes.

Although magnifiers and reading glasses are convex lenses that can enlarge objects, there are many differences between them. Presbyopic glasses are aimed at the eyesight of elderly people and are worn according to the specific conditions of human eyes. It can not only enlarge the object but also maintain vision and protect the eyes. However, the magnifying glass is just an ordinary convex lens. It is not tailored to the special conditions of human eyes, nor does it have the role of protecting the eyes. Long-term use can lead to eye irritation and headaches.

Although the amplification effects of the two are basically the same, but perhaps you do not know, the general magnifying glass, if converted into reading glasses, there will be 1000 to 2000 degrees. This is the "connivance" of your vision. When you want to wear a pair of reading glasses, you can imagine a high degree of vision. You can't even match your glasses. Therefore, in addition to temporary occasions and special occasions, the elderly must not use the magnifying glass as a reading glasses, so as not to hurt the eyes.

Polymer Concrete Cells For ER/EW Processing Of Nonferrous

Vinyl ester resin monolithic casting electrolytic cells

Electrolytic cells are designed, built and installed to satisfy the most stringent requirements requested by tankhouse operators worldwide. In most cases their main request is to guarantee full operating availability throughout the plant's lifespan, maximizing production of high-purity metal (copper, zinc, nickel, cobalt, lead or other nonferrous metals) with absolute safety for people and the environment. Additionally, cells must accommodate changes for continuous improvement of the electrolytic process, integrating efficiently with upgrades of complementary equipment such as anodes, cathodes, cap, boards, overhead crane electrolyte agitation systems, acid mist control devices, thermal insulation among many others.

2. Structure

Electrolytic cells are cast monolithically based on a patented, three-layer composite material system:
The Internal layer is a monolithic tank made with multiple layers of fiber-reinforced vinyl ester resin (FRP) complying with chemical barrier international norms that assure long-term impermeability and corrosion resistance.
The Intermediate layer is the structural core made with polymer Concrete, with a patented formulation to achieve a low coefficient of thermal expansion, providing long-term structural integrity with low thermally-induced stresses
The External layer is a standard seal layer of FRP that further protects the structural core from electrolyte splashes and spills. Optionally,this external seal may be specified with multi-layered oriented fiber reinforcements to guarantee trouble-free operation in unusually extreme operating environments.
Benefits of electrolytic cells

Long-term impermeability, free of corrosion, 20+ years warranty
Our monolithic internal tank manufactured with multiple layers of fiber-reinforced premium vinyl ester resin. It has continuous service without leakage, free of corrosion and structural flaws which operating under normal conditions as specified for each project.
Swift, accurate and less costly installation
Electrolytic cells include features that allow reduction of 25% or more in time needed for cell erection, alignment and leveling compared to time required with conventional polymer concrete cells. Dimension tolerances for electrolytic cells are consistently tight, simplifying installation in the most demanding applications,including plants with automated crane systems.
Minimum cleaning time and water consumption
The rounded internal shape,optional sloped cell floors,and smooth,flat finish of the internal tank,facilitate water sweeping and drainage of heavy sludge,with reduced water usage and accelerating return to service after each cleaning.
Minimum maintenance cost
The robust, virtually impervious internal tank that is chemically bound to the polymer concrete structural core during molding is tolerant to operating abuse its smooth,non-stick surfaces minimize adhesion of contaminants.
Maximum operational safety

The structural core of electrolytic cells is bolstered with sturdy external seismic reinforcement blocks confining its floor supports, and includes a robust, internal bidirectional, pultruded FRP bar mesh reinforcement which positively maintains integrity should the cell fail due to catastrophic events. Electrolytic cell installation protocols call for lateral wall collaboration between cells,thus reducing stress levels of cell around 40% under normal operating conditions.

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Hebei aoliande Chemical Equipment Co., Ltd , https://www.aoliandepipes.com