Read about the most common eyesight illnesses Frequently Asked Questions Español
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 Common Eye Diseases and Problems


What is Pterygium?

El pterygium is the growth of a tissue called conjunctiva which covers much of the eyes inpeding a clear eye vision, it can be caused by direct exposure to sunlight , smog or allergy problems.

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What are cataracts?

A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, varying in degree from slight to complete opacity and obstructing the passage of light.

- Congenital (when born with them)
- Old age (when they appear in people over 50 years)
- Traumatic (appear after a coup or accident directly to the eye)

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What is myopia?

Also called nearsightedness or shortsightedness, is a refractive defect of the eye in which collimated light produces image focus in front of the retina when accommodation is relaxed.

Those with myopia see nearby objects clearly but distant objects appear blurred. With myopia, the eyeball is too long, or the cornea is too steep, so images are focused in the vitreous inside the eye rather than on the retina at the back of the eye.



The opposite defect of myopia is hypermetropia or "farsightedness" or "long-sightedness" — this is where the cornea is too flat or the eye is too short.

Mainstream eye care professionals most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses. It may also be corrected by refractive surgery, such as LASIK. The corrective lenses have a negative optical power (i.e. are concave) which compensates for the excessive positive diopters of the myopic eye.

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What is hyperopia?

Hyperopia, also known as farsightedness, longsightedness or hypermetropia, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred.



Although the majority of hyperopes(Hyperopia patients) often say that they only have difficulty when trying to see near, the active use of their eyeglasses is recommended.

Farsightedness is corrected with prescription glasses, contact lenses or refractive surgery.

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What is tired eyesight or Presbyopia?

Presbyopia describes the condition where the eye exhibits a progressively diminished ability to focus on near objects with age.

Presbyopia's exact mechanisms are not known with certainty, however, the research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens's curvature from continual growth and loss of power of the ciliary muscles (the muscles that bend and straighten the lens) have also been postulated as its cause.

Similar to grey hair and wrinkles, presbyopia is a symptom caused by the natural course of aging; the direct translation of the condition's name is "elder eye". The first symptoms are usually first noticed between the ages of 40-50.

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What are rigid gas permeable contact lenses?

GP contact lenses are also known in the vision care field as rigid gas permeables, or RGPs.
Your eye doctor will probably call them GPs or RGPs.

GP contacts are made of a firm, durable plastic that transmits oxygen. They offer excellent eye health: because they don't contain water, they resist deposits and are less likely than soft contacts to harbor bacteria. GP contact lenses clean and disinfect easily, don't dehydrate, and last longer than soft lenses -- often many years longer.

The rigidity of GP contacts also means they are easier to handle than soft lenses. And since they retain their shape better, they provide crisper vision.

However RG contact lenses are usually prescribed mostly to patients with certain visual problems such as
the keratoconus.

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What are soft contact lenses?

They are more common, replaced rigid gas permeable contact lenses, it's diameter is greater than the size of the iris and the material that is used for it's manufacture is more comfortable and flexible. Usually this are used to correct visual problems
such as: myopia, astigmatism and presbyopia. Adaptation and comfort is very quick.

Soft contact lenses are divided into two types:

  • Frequent replacement or commonly called disposables.
  • Annual Replacement.

Frequent replacement contact lenses can be for:

Daily, weekly, Bi-weekly and Monthly replacement.

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What is OPAQUE PUPIL lenses or what are they for?

This are normally used to aesthetically correct opacities of the cornea, often caused by burns, injuries or illnesses.

Vea un Ejemplo de lente de Pupila Negra.

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How do Bifocal contact lenses work?


There are different designs, one of them is the multifocal lenses, works as a kind of progressive lens with which you can see at different distances, far near, and middle, very comfortable and easy adaptation.

Example of lenses with this design: Focus Progressives y Soft-Lens multifocal.


This type of contact lens interacts both visions far and near, through these concentric circles where distance vision will correspond to the blue circles and close vision through the yellow circles.

Example of lenses with this design: Acuvue Bifocal.

What is monovision?

Depending on the prescription and occupation of the patient in certain cases of presbyopia
monovision can be adapted. This is no more than the adaptation of a contact lens with the prescription
for far sight in the eye of greater visual acuity or dominant and the adaptation of another contact
lens for close sight, this type of adjustments works in many patients and others not so much
that is why is applicable only in certain types of patients.

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What keratoconus?

Keratoconus is a degenerative disorder of the eye in which structural changes within the cornea
cause it to thin and change to a more conical shape than its normal gradual curve.

Keratoconus can cause substantial distortion of vision, with multiple images, streaking and sensitivity to light all often reported by the patient.

It is typically diagnosed in the patient's adolescent years and attains its most severe state in the twenties and thirties. If afflicting both eyes, the deterioration in vision can affect the patient's ability to drive a car or read normal print. In most cases, corrective lenses are effective enough to allow the patient to continue to drive legally and likewise function normally.

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