英文字典中文字典Word104.com



中文字典辭典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z   


安裝中文字典英文字典辭典工具!

安裝中文字典英文字典辭典工具!








  • Bifocal Lenses: Uses, Pros, Cons, and More - Vision Center
    Bifocal lenses offer two prescriptions in one pair of eyeglasses The top half corrects distance vision, and the bottom half corrects near vision The two sections are divided by a distinct visible line People with presbyopia (difficulty seeing close objects) are most commonly prescribed bifocals
  • Bifocals - Wikipedia
    Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and or astigmatism Benjamin Franklin is generally credited with the invention of bifocals
  • What Are Bifocals? How Do They Work? - Warby Parker
    The top part of a bifocal lens corrects distance vision, while a smaller portion at the bottom of the lens corrects near vision When looking closely at bifocal lenses, you can see a line where these different viewing zones meet
  • Bifocal Lenses: All about Bifocals - Optography
    What is a Bifocal Lens ? A Bifocal lens is an ophthalmic lens specially designed to compensate for visual deficiencies, such as ‘presbyopia’, combined with other various ametropias Presbyopia (Greek word) means ‘age of sight’
  • What Are Bifocals and What Are They Used For? - Glasses. com
    What Are Bifocal Glasses? When you’re young, the natural lens inside your eyes is flexible It can easily shift focus so you can see clearly up close and far away
  • Bifocal Lenses: Pros, Cons, and Who Is a Candidate?
    What Are Bifocal Lenses? A bifocal lens corrects two refractive errors simultaneously (farsightedness and nearsightedness) by incorporating two different optic zones With most prescriptions, the top zone provides distance focusing power, while the bottom lets you see close-up objects clearly
  • Bifocals and Trifocals - A Complete Guide - All About Vision
    As a bifocal wearer drops his eyes downward to read, the eyes naturally seek out the near-vision portion of the lens Try these interactive Rx forms to learn what the measurements mean on your eyeglass prescription or contact lens prescription
  • Bifocal Contacts Lenses: How Do They Work? - GoodRx
    Bifocal contacts combine up-close and distance vision prescriptions into a single lens That way you can see both near and far — without glasses A variety of bifocal and multifocal contact options are available


















中文字典-英文字典  2005-2009

|中文姓名英譯,姓名翻譯 |简体中文英文字典