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Although the lenses appear similar in layout, there is a lot more to the design and performance of a lens than simply the layout of the glass elements.
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Although and lenses
Although safety lenses may be constructed from a variety of materials of various impact resistance, certain standards suggest that they maintain a minimum 1 millimeter thickness at the thinnest point, regardless of material.
Although all the above lens types — sclerals, PMMA lenses and RGPs — could be correctly referred to as being " hard " or " rigid ", the term hard is now used to refer to the original PMMA lenses, which are still occasionally fitted and worn, whereas rigid is a generic term that can be used for all these lens types: hard lenses ( PMMA lenses ) are a sub-set of rigid lenses.
Although many brands of contact lenses are lightly tinted to make them easier to handle, cosmetic lenses worn to change the color of the eye are far less common, accounting for only 3 % of contact lens fits in 2004.
Although the materials are the same, the manufacturing processes by which the respective contact lenses are made is what differentiates a " daily disposable " lens from a lens recommended for two-week or 4-week replacement.
Although many companies make contact lenses, in the US there are four major manufacturers:
) Although Brunschvicg tried to classify the posthumous fragments according to themes, recent research has prompted Sellier to choose entirely different classifications, as Pascal often examined the same event or example through many different lenses.
Although the Nikon IX series of lenses were not compatible with the Nikon 35 mm SLR, lenses for the Nikon 35 mm SLR were compatible with the Nikon Pronea.
Although Digges may have created a rudimentary instrument involving lenses and mirrors, the optical performance required to see the details of coins lying about in fields, or private activities seven miles away, was far beyond the technology of the time.
Although a hydrops usually causes increased scarring of the cornea, occasionally it will benefit a patient by creating a flatter cone, aiding the fitting of contact lenses.
Although they still suffer from the typical handling and usability deficiencies of other multipurpose devices, HDSLR video offers shallow depth-of-field and interchangeable lenses which consumer camcorders lack.
Although some contact lenses ( notably modern RGP and soft silicone hydrogel lenses ) are made of materials with greater oxygen permeability that help reduce the risk of corneal neovascularization, patients considering LASIK are warned to avoid over-wearing their contact lenses.
Although many people think of lenses as magnifiers, the lenses within eyeglasses improve vision primarily by reducing blur.
Although it has high impact-resistance, it has low scratch-resistance and so a hard coating is applied to polycarbonate eyewear lenses and polycarbonate exterior automotive components.
Although the Nikon F3AF ( 1983 ), Pentax ME F and Chinon CE-5 already had presented autofocus single lens reflex cameras, autofocusing could not be achieved without the use of special motorised AF lenses.
Although PIOLs for hyperopia are being investigated, there is less enthusiasm for these lenses because the anterior chamber tends to be shallower than in myopic patients.
Although and appear
Although he uses the terms interchangeably, remarks that, for example, the final glides of English par and buy differ from French par (' through ') and baille (' tub ') in that, in the latter pair, the approximants appear in the syllable coda, whereas, in the former, they appear in the syllable nucleus.
Although officially declassified, the original film taken by U. S. Corona spy satellite in the 1960s has been altered prior to declassification ; in answer to freedom of information queries, the government responds that these exposures ( which map to Groom and the entire NAFR ) appear to have been destroyed .< ref >
Although the permanency of acrylics is sometimes debated by conservators, they appear more stable than oil paints.
Although the butterfly effect may appear to be an esoteric and unlikely behavior, it is exhibited by very simple systems: for example, a ball placed at the crest of a hill may roll into any of several valleys depending on, among other things, slight differences in initial position.
Although possibly Celtic-speaking in 179 BC, the Bastarnae probably were Germanic in language and culture during the 1st century AD, but appear to have become assimilated by their neighbouring Sarmatians by the 3rd century.
Although his name does not appear in any other part of the Jewish Bible, Rabbinic tradition holds Habakkuk to be the Shunammite woman's son, who was restored to life by Elisha in 2 Kings 4: 16.
Although there is no proof, the name " Thomas Corbett " does appear on the list of dead and missing.
Although dream sleep and non-dream sleep appear very similar to an outside observer, each is associated with a distinct pattern of brain activity, metabolic activity, and eye movement ; each is also associated with a distinct pattern of experience and cognition.
Although a coma patient may appear to be awake, they are unable to consciously feel, speak, hear, or move.
Although privacy-advocates have questioned such methods, they appear to serve the interests of the organisations using them.
Although especially common in stories told by southwestern Native American nations, such as the Diné and Apache, stories about Coyote appear in dozens of Native American nations from Canada to Mexico.
Although Triatominae bugs feed on them, birds appear to be immune to infection and therefore are not considered to be a T. cruzi reservoir.
Although many psychologists believe that the entire brain is involved with memory, the hippocampus and surrounding structures appear to be most important in declarative memory specifically.
Although its decisions are accepted by all Christians, and still observed in full by the Greek Orthodox, and later definitions of an ecumenical council appear to conform to this sole biblical Council, no Christian church calls it a mere ecumenical council, instead it is called the " Apostolic Council " or " Council of Jerusalem ".
Although perennialism may appear similar to essentialism, perennialism focuses first on personal development, while essentialism focuses first on essential skills.
Although these two forces appear very different at everyday low energies, the theory models them as two different aspects of the same force.
Although verse 7 does not appear in any version of the Greek text prior to the ninth century, it appears in most of the Latin manscripts, especially in the Vetus Itala ( Old Latin predating Jerome ).
Although a male deity existed as well, “… statues of a female deity far outnumber those of the male deity, who moreover, does not appear to be represented at all after Level VI ”.
Although theoretically a significant blow to John's legitimacy, this did not appear to greatly worry the king.
Although Luthor would not appear until two years after Superman's debut, a central theme to his character — a dichotomy of science versus superpowers — was in place.
Although they reign under constitutions, the monarchs of Brunei, Oman, Qatar, Saudi Arabia and Swaziland appear to continue to exercise more political influence than any other single source of authority in their nations, either by constitutional mandate or by tradition.
Although he conducted some of his studies using vivisection and others through the dissection of corpses, his most illustrative efforts appear to have been based on the use of the microscope.
Although outwardly masts may appear irrational or even insane, Baba indicated that their spiritual status was actually quite elevated, and that by meeting with them he helped them to move forward spiritually while enlisting their aid in his spiritual work.
Although there exist occasional reports of opposition to the government, these appear to be isolated, and there is no evidence of major internal threats to the current regime.
Although and similar
Although a similar situs for tangible property is mentioned in the statute, this is cancelled out by the provision that definite kinds of property `` and all other tangible property '' situated or being in any town is taxable where the property is situated.
Although MND refers to a specific subset of pathologically similar diseases ; there are numerous other afflictions of motor neurons that are pathologically distinct from MND and have a different clinical course.
Japan celebrates a similarly themed Greenery Day, held on May 4. Although it has a similar theme to Arbor Day, its roots lay in celebration of the birthday of Emperor Hirohito.
Although used for similar purposes, transparent colors and image masks do not permit the smooth blending of the superimposed image pixels with those of the background ( only whole image pixels or whole background pixels allowed ).
Although systems similar to AARP existed in other systems, Banyan VINES for instance, nothing like NBP has existed until recently.
Although Anabaptists began with the Radical Reformers in the 16th century, certain people and groups may still legitimately be considered their forerunners due to a similar approach to the interpretation and application of the Bible.
Although the hard-part bearing organisms make up as little as 14 % of the community, these same organisms are found in similar proportions in other Cambrian localities.
Although bongos are quite easy for humans to catch via snares ; it is of interest that many people native to the bongos habitat believed that if they ate or touched bongo they would have spasms similar to epileptic seizures.
Although Basic English was not built into a program, similar simplifications have been devised for various international uses.
Although the mechanism differs from country to country, most use a similar mechanism based on a central bank's ability to create as much fiat money as required.
Although Wegener's theory was formed independently and was more complete than those of his predecessors, Wegener later credited a number of past authors with similar ideas:
Although its texture is similar to milk and dark chocolate, it does not contain any cocoa solids.
Although Kronecker had conceded, Hilbert would later respond to others ' similar criticisms that " many different constructions are subsumed under one fundamental idea " — in other words ( to quote Reid ): " Through a proof of existence, Hilbert had been able to obtain a construction "; " the proof " ( i. e. the symbols on the page ) was " the object ".
Although " dementia " is part of the name of the disease, Kraepelin did not intend it to be similar to senile dementia and rarely used this term to refer to the end state of the disease.
Although there were earlier works of similar nature, by Marcus Terentius Varro for example, Pliny's was the only one to survive the Dark Ages.
Although the grammatical structures of Yupik and Inuit languages are similar, they have pronounced differences phonologically, and differences of vocabulary between Inuit and any of one of the Yupik languages is greater than between any two Yupik languages.
Although it was Sartre who explicitly coined the phrase, similar notions can be found in the thought of existentialist philosophers such as Kierkegaard and Heidegger.
Although the Estonian and Germanic languages are of very different origins, one can identify many similar words in Estonian and English, for example.
Although Bischoff ’ s 1840 surveys depict how similar the early embryos of man are to other vertebrates, he later demanded that such hasty generalization was inconsistent with his recent findings regarding the dissimilarity between hamster embryos and those of rabbits and dogs.
* Linear algebraic groups ( or more generally affine group schemes ) — These are the analogues of Lie groups, but over more general fields than just R or C. Although linear algebraic groups have a classification that is very similar to that of Lie groups, and give rise to the same families of Lie algebras, their representations are rather different ( and much less well understood ).
Although there would be no point in encoding the file that way, something similar typically happens for bi-color images: the minimum symbol width is 2, even if only values 0 and 1 are used.
Although it received enthusiastic reviews, the release failed to chart ; his next album, Grievous Angel ( released posthumously in 1974 ) met with a similar reception, and peaked at number 195 on Billboard.
Although, in the United Kingdom ( UK ), the pejorative noun " anorak " ( similar to the Japanese " otaku ", meaning a geek or enthusiast ) is often applied to people who obsessively pursue a particular hobby that is otherwise considered boring.
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