Lenses and How They Work

Lone Tree, Castle Rock, & the Greater Denver Area

The lens of our eye plays a very significant role in our vision.  It is located immediately behind the iris   that performs a delicate focusing of light rays upon the retina.  Muscles hold the lens in place.  Our eye is a complex organ composed of many small parts and each is vital to our normal vision and part of that is the lens. It helps in refracting the light to be focused on the retina of the eye.

How Does Your Eye Focus?

The components of the eye works like that of a camera and each part plays a vital role in providing a clear vision.  The cornea is the eye’s main focusing element that takes widely diverging rays of light and bends them to the pupil of the eye.  The role of the lens along with the cornea is to help focus the light to the back of the eye on which where the retina is.  The retina acts like that of a film in a camera which is responsible for our sharp vision.  The lens can change shape depending on the focal distances that the eye focuses, thereby creating sharp real image of the object to be formed on the retina.

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Near Sightedness, Far Sightedness and Astigmatism

Near sightedness also known as myopia is a condition of the eye caused by improper light focus to the retina.  This is an eye condition when a person can see better at close range than at a considerable distance.  Things will appear blurry when you are looking far away.  On the other hand, far sightedness or hyperopia is an eye condition in which a person can see better from a far distance than up close.  The reason of hyperopia is caused by a smaller eye than average and results in the light focusing behind the retina instead of on the retina itself.  Both of these conditions can hinder your daily activity and can even worsen to lead to eye strain and headaches.

An astigmatism is a distortion of normal vision because of the incorrect shape of the cornea which can prevent the light from properly focusing on the retina.  A normal cornea is shaped like a basketball, whereas the shape of a cornea of a person with astigmatism is more like of a football.

These refractive error conditions can be specifically treated by the following:

  • Glasses or Contacts – People suffering from near sightedness, far sightedness and astigmatism can opt for this especially when the condition is only mild and glasses and soft contact lenses can rightfully correct their vision.  Myopia or nearsightedness will be corrected by bending the visual images that enter into the eye.  Far sightedness or a person with astigmatism will also be corrected by altering the way the light that enters into the eyes.
  • PRK / LASIK -  PRK (Photorefractive Keratectomy) and LASIK are both types of a laser eye surgery to correct the vision although PRK is the predecessor of LASIK eye surgery.  Myopia, hyperopia and astigmatism can be corrected through these surgical procedures by reshaping the cornea with the use of a laser to correct the light entering into the eyes to properly focus on the retina for a clear vision.
  • Refractive Lens Exchange – Refractive lens exchange is a better option as compared to LASIK or PRK and is ideal for people who suffer from presbyopia or extreme farsightedness.  This procedure will work by replacing your eye’s natural clear lens with an artificial one called an intraocular lens (IOL) to correct the vision and achieve a clear and sharper focus without a need to wear any bifocals or reading glasses.
  • Cataract Surgery – Refractive errors like myopia, hyperopia and astigmatism can be corrected through a cataract removal by surgery.  This can be fully utilized by simultaneous modification of the cornea during cataract removal with a lens implantation.

Please contact Margolis Vision today to schedule an appointment. We serve patients in Lone Tree, Castle Rock, and throughout the Denver area.