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Bifocal lenses have two parts: the upper part normally used for distance vision and the lower part used for near vision tasks such as reading. Many people after reaching age 45 develop a condition called Presbyopia, which is a deterioration in the ability of the eye’s natural lens to expand or contract in order to focus on close objects. People with Presbyopia need a special lens for reading and may need a different lens for seeing in the distance.

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Checking is very common in post and beam construction. The material is going through it’s normal routine and you have to live with it. In my mind it adds to the character of the building. Larry

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Laser coagulation or laser photocoagulation surgery is used to treat a number of eye diseases and has become widely used in recent decades.

Trifocal lenses have three different focus areas: the top for distance, the center for intermediate vision, and the bottom for near vision.

Polarization is a contrast enhancement technique that can reduce back reflections and bring out features not readily visible with normal viewing. Polarized Lenses eliminate glare. Any surface can create glare in sunlight, including water, sand, snow, buildings, windows and vehicles. They can, in fact, reduce the glare that comes off a long, flat surface such as the hood of a car on the highway.

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Bolts are commonly used to limit the size and effects of the cracking, which would probably be part of the design requirements in the seismic zone that I call home.

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Have only done a few post and beam inspections. This morning’s had cracks or splits in many members from drying out. Some where approximately 3/8 to 1/2 inch wide and go through 1/2 the width of the timber. Is this excessive? Is there anything else I should be looking for?

Is there a maximum size for checking? I had some checking that was around an inch today. It just looked larger than what I have seen in the past but I have only done a handful of post and beam inspections.

The gray, smoke or green lenses are the most popular because not only do they cut the bright light but they also help keep the colors appearing the most natural and true. Polarized lenses can also be used indoors by those persons with light-sensitive eyes or those exposed to bright light through windows or while on the computer.

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I think those can be considered part of the design spec. Just like 2x4 walls are designed to have x amount of holes drilled without affecting the purpose.

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I think those can be considered part of the design spec. Just like 2x4 walls are designed to have x amount of holes drilled without affecting the purpose.

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Thanks for the replies, I got a hold of a local timber framer this morning and that was his response, that the checking, as he called it, was normal when the timbers used had the heart of the tree at or near the center of the timber.

Polarized lenses are the top recommendation for boaters and fishermen, golfers, drivers, bikers, hunters, and joggers, just to name a few. For these activities, they offer a clearer view by eliminating the glare.

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Multifocal literally means “having more than one focus” so bifocal and trifocal lenses are actually types of multifocal lenses. In addition to bifocal and trifocal lenses, the other multifocal is a progressive addition (no-line bifocal) lens that increases in power from the top to bottom of the lens. Progressive lenses have no clear dividing lines as the focus changes from bottom to top. Progressive addition lenses avoid the “image jump” in the visual field created by bifocal and trifocal lenses and are more cosmetically attractive.

Agree with above. Generally checking does not affect the strength of the timber frame structure. You will find the same thing in log homes.

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Single Vision lenses have the same power throughout (top and bottom) and can be used to correct nearsightedness, farsightedness, astigmatism, or a combination of these disorders. Most people who wear glasses before the age of 40 have Single Vision lenses.

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Just like ordinary clear lenses, original Transitions lenses are clear when indoors and at night. Once outdoors, these lenses conveniently adapt to varying light conditions and become darker in either grey or brown activated color options. These everyday lenses provide continuous comfort and peace of mind by decreasing glare, reducing eye fatigue and blocking 100% of UV rays. This lens option is ideal for kids too!

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Checking is the correct term, and checking is characteristic of Douglas Fir. It is a sinewy wood, and that’s what gives it its strength over most other woods. I love to see post and beam construction with large checks in it. On the name subject, you’ll often see Doug fir headers that came out of the center of the tree twist around their own centers. Nothing will stop them. I saw one lift several stories as it turned.

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