翻訳と辞書
Words near each other
・ Oxymerus chevrolatii
・ Oxymerus lineatus
・ Oxymerus luteus
・ Oxymerus pallidus
・ Oxymerus punctatus
・ Oxymerus vianai
・ Oxymerus virgatus
・ Oxymesterone
・ Oxygen Green Party
・ Oxygen index
・ Oxygen isotope ratio cycle
・ Oxygen mask
・ Oxygen minimum zone
・ Oxygen Music Works
・ Oxygen of Love
Oxygen permeability
・ Oxygen plant
・ Oxygen Project
・ Oxygen pulse
・ Oxygen radical absorbance capacity
・ Oxygen regulation
・ Oxygen saturation
・ Oxygen saturation (medicine)
・ Oxygen scavenger
・ Oxygen sensor
・ Oxygen SpA
・ Oxygen storage
・ Oxygen Studios
・ Oxygen tank
・ Oxygen tent


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Oxygen permeability : ウィキペディア英語版
Oxygen permeability

Oxygen permeability (OP) is a parameter of a contact lens. OP expresses the ability of the lens to let oxygen reach the eye by diffusion. Another parameter is the transmissibility level (abbreviated DK/t), the Dk per thickness of the lens, and is generally more used. In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.
Typical values for hydrogel contact lenses are from 25 to 50. For example, Nelfilcon A has a Dk value of 26, and the Omafilcon A has a Dk of 25.
However, one of the particular benefits of silicone hydrogel is high oxygen permeability. For example, the dk value of Lotrafilcon B is 110 and Comfilcon A is 128, twice more than the hydrogel lenses.
D being diffusivity (cm2/sec)--a measure of how fast the oxygen moves through the material. Note, different sources may use different units: contact package inserts often use cm2/sec, while academic papers may use other values for distance such as mm2/sec.
k being the solubility (ml O2/ml of material x mm Hg)--a measure of how much oxygen is contained in the material. Once again, various sources may use units of different sizes. Do not assume that they're the same unless specified by the source.
== External links ==

* (Oxygen Permeability of Contact Lenses Materials )
* (Dk values ) (See page 4)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Oxygen permeability」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.