20/20 vision, vista, retina, acuity, refract, 20/70 vision, Alzheimer' , diplomatic Kabuki?

Retinal scanning could be a huge leap forward. Even in rich countries, 50% to 80% of Alzheimer's cases go undiagnosed

And, after that, of stroke susceptibility and heart disease








ECONOMIST.COM


A system based on AI will scan the retina for signs of Alzheimer’s

The episodes they recount, so often set amid vistas of piercing natural beauty, also tell of the refined recreations and aristocratic rituals of classical Japan. They show the technological change and cultural ferment that arrived in the 19th century. And with astonishing detail, they report on fashions in clothing, hairstyles and décor. Then, to keep things really lively, they give us all this refracted by the theater, with images of Kabuki actors performing stage versions of the Genji tales. 

Is talk of an Olympic boycott real or diplomatic Kabuki?

https://s.nikkei.com/3vaZOkq

ASIA.NIKKEI.COM
Is talk of an Olympic boycott real or diplomatic Kabuki?
IOC finds itself hard-pressed to stay neutral as athletes begin to speak out

　《Ars Technica》表示，在登入紀錄中，有346筆的紀錄，螢幕設備解析度為2048x1536，比iPad2高出一倍。而許多傳言指出，具有這麼高解析 度的螢幕，應該就是由蘋果公司研發的「視網膜螢幕」（Retina Display，此螢幕具有肉眼視網膜無法辨識的高解析度）。

visual acuity

如果你兩眼視力都是1.0，那麼恭喜你視力良好。老美對1.0視力良好者，以「twenty-twenty」稱之，寫成國字就是2020。由於「2020」有視野清晰的涵意，故有些電視節目也以「2020」名之，代表其評論之清晰入理。

See also: Eye examination

Typical Snellen chart used for visual acuity testing.

Visual acuity (VA) is acuteness or clearness of vision, especially for vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain.^[1]

Visual acuity is a measure of the spatial resolution of the visual processing system and is usually tested in a manner to optimise and standardise the conditions. To this end black symbols on a white background are used (for maximum contrast) and a sufficient distance allowed to approximate infinity in the way the lens attempts to focus. Twenty feet is essentially infinity from an optical perspective (the difference in optical power required to focus at 20 feet versus infinity is only 0.164 diopters). Whilst in an eye exam lenses of varying powers are used to precisely correct for refractive errors, using a pinhole will largely correct for refractive errors and allow VA to be tested in other circumstances. Letters are normally used (as in the classic Snellen chart) as most people will recognise them but other symbols (such as a letter E facing in different directions) can be used instead.

In the term "20/20 vision" the numerator refers to the distance in feet between the subject and the chart. The denominator is the distance at which the lines that make up those letters would be separated by a visual angle of 1arc minute, which for the lowest line that is read by an eye with no refractive error (or the errors corrected) is usually 20 feet. The metric equivalent is 6/6 vision where the distance is 6 meters. This means that at 20 feet or 6 meters, a typical human eye, able to separate 1 arc minute, can resolve lines with a spacing of about 1.75mm. 20/20 vision can be considered nominal performance for human distance vision; 20/40 vision can be considered half that acuity for distance vision and 20/10 vision would be twice normal acuity. The 20/x number does not directly relate to the eyeglass prescription required to correct vision, because it does not specify the nature of the problem with the lens, only the resulting performance. Instead an eye exam seeks to find the prescription that will provide at least 20/20 vision.^{[citation needed]}

Microsoft Pitches Merger Vision

Microsoft and Yahoo senior executives met Monday in a session intended to let Microsoft present its vision of a combined company.

Chinese Vistas

The 60th anniversary Reith Lectures take China as their subject, and are given by the eminent historian Professor Jonathan Spence.

Each of the lectures will be available after broadcast to listen again or download.

Lecture 1: Confucian Ways

Recorded at the British Library, London, broadcast on 03 June 2008.

vista

Pronunciation: /ˈvɪstə/

Translate vista | into French | into Italian | into Spanish

noun

• a pleasing view:sweeping lawns and landscaped vistas
• a long, narrow view as between rows of trees or buildings, especially one closed by a building or other structure.
• a mental view of a succession of remembered or anticipated events:vistas of freedom seemed to open ahead of him

Origin:

mid 17th century: from Italian, literally 'view', from visto 'seen', past participle of vedere 'see', from Latin videre

vista Show phonetics

noun [C]

1 LITERARY a view, especially a splendid view from a high position:

After a hard climb, we were rewarded by a picture-postcard vista of rolling hills under a deep blue summer sky.

2 a possible future action or event that you can imagine:

As leader, he opened up exciting vistas of global co-operation.

 vis・ta  

━━ n. （木立・町並などを通した狭い）見通し, 眺望; （見通しのきく）通り, 町並; 予想, 展望; 回想.

 Vista・Vision　━━ n. 【商標】ビスタビジョン ((米国で開発されたワイドスクリーンの映画撮影［映写］法)).

這 vision 在企業管理上有許多人稱之為"願景"-- 對於為未來的想像有些信心

如vision statement 詳後補

n.

視力, 視覺, 先見之明, 眼力, 想象力, 幻想, 幻影, 景象

vt.

夢見, 想象, 顯示

vision

n.

視力

She has good vision.

她的視力很好。

遠見；洞察力

幻影，幻像

念頭；想象

He had a vision of himself as a rich businessman.

他想象自己是一個富有的商人。

美景；美人

She really is a vision.

她真是個美人。

vision

n.

視力, 視覺, 視野

洞察力; 想象力; 眼力

幻象, 夢想, 幻影

美景; 美人; 絕妙的東西

【宗】顯圣;【醫】幻視

(修辭學的)描述; 電影中的回憶場面, 幻想場面

the field of vision

視野

a person of broad vision

見解廣闊的人

The lady was a lovely vision.

這位貴婦模樣兒長得很美。

vision

vt.

在夢(幻)中看見; 想象; 顯示

vision-mix

n.

溶合(鏡頭)

visional

[`vIVEnEl]

adj.

visionally

adv.

beyond one's vision

在視野之外, 看不見的

have vision of

想象到, 幻想

see visions

見幻象, 能預卜未來, 做先知

tunnel vision

狹隘的視野; 井蛙之見

back vision

后視

binocular vision

雙目鏡觀察

雙目視覺

blurred vision

視力模糊; 視力障礙

brightness vision

亮度視覺

chromatic vision

色覺

colour vision

色視覺

data vision

數據顯示

defective colour vision

視覺缺陷

deuteranomalous vision

綠色弱(視覺)

dichromation vision

二色性色盲

distinct vision

明晰視覺

double vision

復視覺

electric vision

電視

foveal vision

【生理】視網膜中央凹視力

indirect vision

間接視覺

instant vision

瞬間可視圖象, 瞬間接收圖象

mesopic vision

過渡視覺; 黃昏黎明視覺

mesoptic vision

【生理】中間視覺

monocular vision

單眼視覺

night vision

夜視, 微光攝象電視

normal trichromatic vision

正常三色視覺

peripheral vision

周圍視覺; 間接視力

photopic vision

亮視覺, 白晝視覺

【生理】光適應力

protanomalous vision

紅色弱

recurrent vision

【光】回復視覺

scotopic vision

暗[夜, 微光]視覺

space vision

空間電視

spatial vision

立體電視

split vision

余光

stereoscopic vision

【生理】立體視覺

trichromatic vision

三色視覺

twilight vision

暗視覺

underwater vision

水下視覺

Vista V-

【攝】維斯塔維申寬銀幕

yellow vision

【醫】黃視癥

vision on sound

圖象信號對伴音的干擾

refract

Pronunciation: /rɪˈfrakt/

Translate refract | into German

verb

[with object]

• (of water, air, or glass) make (a ray of light) change direction when it enters at an angle:the rays of light are refracted by the material of the lens
• measure the focusing characteristics of (an eye) or of the eyes of (someone): when refracting patients an ophthalmologist relies on verbal reports

Origin:

early 17th century: from Latin refract- 'broken up', from the verb refringere, from re- 'back' + frangere 'to break'

這是yahoo! answer的問答

對我有點幫助

What is 20/70 vision?

Its a measure of you visual acuity. 20/20 vision means you are seeing at 20 feet what a person with normal vision would see at 20 feet, and your vision is perfect. 20/70 means that what you are seeing at 20 feet is what a person with normal vision would see at 70 feet. The higher the second number, the worse your vision. Example a person with normal 20/20 vision can read a clock on a wall 20 feet away, but for you that same clock looks like it's 70 feet away and is unreadable.

Low Vision

Low vision is the loss of sight that is not correctible with prescription eyeglasses, contact lenses, or surgery. This type of vision loss does not include complete blindness, because there is still some sight and it can sometimes be improved with the use of visual aids.

Low vision includes different degrees of sight loss, from blind spots, poor night vision, and problems with glare to an almost complete loss of sight. The American Optometric Association defines low vision as two categories:

"Partially sighted": the person has visual acuity between 20/70 and 20/200 with conventional prescription lenses.

"Legally blind": the person has visual acuity no better than 20/200 with conventional correction and/or a restricted field of vision less than 20 degrees wide.

The ratio measurement of vision describes visual acuity, or the sharpness of vision, at 20 feet from an object. For example, having 20/70 vision means that you must be at 20 feet to see what a person with normal vision can see at 70 feet.

Anyone can be affected by low vision because it results from a variety of conditions and injuries. Because of age-related disorders like macular degeneration, glaucoma, and cataracts, low vision is more common in adults over age 45, and even more common in adults over age 75. For example, one in six adults over age 45 has low vision; one in four adults over age 75 has low vision.

The most common types of low vision include:

Loss of central vision: There is a blind spot in the center of one’s vision.

Loss of peripheral (side) vision: Inability to see anything to either side, above or below eye level. Central vision, however remains intact.

Night blindness: The inability to see in poorly lit areas such as a theater, as well as outside at night

Blurred vision: Objects both near and far appear out of focus.

Hazy vision: The entire field of vision appears to be covered with a film or glare.

What causes low vision?

There may be one or more causes of low vision. These are usually the result of disorders or injuries affecting the eye or a disorder such as diabetes that affects the entire body. Some of the most common causes of low vision include age-related macular degeneration, diabetes, and cataracts. Low vision may also result from cancer of the eye, albinism, or a brain injury. If you have these disorders or are at risk for them, you are also at greater risk for low vision.

How is low vision diagnosed?

An eye exam by your eye care specialist can diagnose low vision. You should make an appointment with your eye doctor if your vision difficulties are preventing you from daily activities like travel, cooking, work, and school. The tests the eye doctor will perform include the use of lighting, magnifiers, and special charts to help test visual acuity, depth perception, and visual field.

Can low vision be treated?

Some sight disorders, like diabetic retinopathy, can be treated to restore or maintain vision. When this is not possible, low vision is permanent. However, many people with low vision find visual aids helpful. Popular low vision aids include:

Telescopic glasses

Lenses that filter light

Magnifying glasses

Hand magnifiers

Closed-circuit television

Reading prisms

Non-optical aids designed for people with low vision are also very helpful. Some popular non-optical devices include:

Text reading software

Check guides

High contrast clocks and watches

Talking watches and clocks

Large print publications

Clocks, phones, and watches with enlarged numbers

Visual aids improve both sight and the quality of life for many people. Talk to your doctor about where to purchase visual aids.

Can low vision be prevented?

Low vision may be preventable for patients with diabetes and reversible for those whose vision loss is caused by cataracts.