近視

近視

甚麼是近視?

近視是一種常見的屈光問題,患者看近距離物件清晰,遠距離物像模糊

甚麼是深近視?

深近視是一種較嚴重的情況,在深近視的情況下,眼球因過長而對視網膜構成拉扯壓力,會導致出現視網膜撕裂甚或脫落的情況。視網膜下亦有機會出現異常新增血管,有機會引致視力受損。患有深近視的人士應定期接受全面的放瞳眼底檢查,及早發現和治療相關問題,有助預防視力受損

成因及風險因素

近視如何形成?

近視構成的原因是影像過份聚焦,投射在視網膜前方,導致影像模糊。此現象的形成是由於眼球過長,角膜弧度過彎,導致影像未能準確投射在視網膜上

易患上近視的一群?

受近視影響的群組,包括成人及兒童。兒童最常被確診患上近視的年齡是介乎8–12歲之間,而在青春期間,近視的情況最易惡化。絕大部分情況,在青春期後,進入成年階段,20–40歲期間,近視度數會較為穩定,變化亦相對較少,但亦會有少部份父母親都是近視患者的人,他們的近視度數卻會隨年齡繼續増加

症狀與檢查

近視會出現的症狀?

部份近視可能出現的症狀包括:

  • 頭痛
  • 眼睛易疲勞
  • 觀看遠處景物模糊,例如路牌
如何診斷患有近視?

眼科專業人員(例如:視光師 / 眼科醫生) 可以透過屈光及全面眼睛檢查,準確診斷病人患有近視或其他屈光不正問題

治療

如何矯正近視?

近視可以透過眼鏡、隱形眼鏡及激光矯視手術矯正

隱形眼鏡的原理是利用光線在表面屈折後進入眼睛,造出更精確的焦點。

激光矯視手術會永久改變角膜形狀,改善屈折後的視力。手術能減低或消除患者對眼鏡或隱形眼鏡的依賴。

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We do not sell, trade, or otherwise transfer to outside parties your personally identifiable information. This does not include trusted third parties who assist us in operating our website, conducting our business, or servicing you, so long as those parties agree to keep this information confidential. We may also release your information when we believe release is appropriate to comply with the law, enforce our site policies, or protect ours or others rights, property, or safety. However, non-personally identifiable visitor information may be provided to other parties for marketing, advertising, or other uses.

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The minimum information we need to register you is your name, email address and a password. We will ask you more questions for different services, including sales promotions. Unless we say otherwise, you have to answer all the registration questions. We may also ask some other, voluntary questions during registration for certain services (for example, professional networks) so we can gain a clearer understanding of who you are. This also allows us to personalise services for you. To assist us in our marketing, in addition to the data that you provide to us if you register, we may also obtain data from trusted third parties to help us understand what you might be interested in. This ‘profiling’ information is produced from a variety of sources, including publicly available data (such as the electoral roll) or from sources such as surveys and polls where you have given your permission for your data to be shared. You can choose not to have such data shared with the Guardian from these sources by logging into your account and changing the settings in the privacy section. After you have registered, and with your permission, we may send you emails we think may interest you. Newsletters may be personalised based on what you have been reading on theguardian.com. At any time you can decide not to receive these emails and will be able to ‘unsubscribe’. Logging in using social networking credentials If you log-in to our sites using a Facebook log-in, you are granting permission to Facebook to share your user details with us. This will include your name, email address, date of birth and location which will then be used to form a Guardian identity. You can also use your picture from Facebook as part of your profile. This will also allow us and Facebook to share your, networks, user ID and any other information you choose to share according to your Facebook account settings. If you remove the Guardian app from your Facebook settings, we will no longer have access to this information. If you log-in to our sites using a Google log-in, you grant permission to Google to share your user details with us. This will include your name, email address, date of birth, sex and location which we will then use to form a Guardian identity. You may use your picture from Google as part of your profile. This also allows us to share your networks, user ID and any other information you choose to share according to your Google account settings. If you remove the Guardian from your Google settings, we will no longer have access to this information. If you log-in to our sites using a twitter log-in, we receive your avatar (the small picture that appears next to your tweets) and twitter username.

Children’s Online Privacy Protection Act Compliance

We are in compliance with the requirements of COPPA (Childrens Online Privacy Protection Act), we do not collect any information from anyone under 13 years of age. Our website, products and services are all directed to people who are at least 13 years old or older.

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We offer a ‘My details’ page (also known as Dashboard), where you can update your personal information at any time, and change your marketing preferences. You can get to this page from most pages on the site – simply click on the ‘My details’ link at the top of the screen when you are signed in.

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