Articles starting with 'P':
| PACHYMETRY |
The measurement of intra-ocular pressure (pressure within the eye) is an important element in the detection of glaucoma. Historically doctors have accepted eye pressure values directly. It is now understood that when intra-ocular pressure is measured the validity of the pressure test is directly influenced by the thickness of the cornea, the outer clear window of the eye. Since the thickness of the cornea varies meaningfully from eye to eye, it becomes a factor in the determination of ... Read More
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| PAPILLEDEMA |
Papilledema is an ocular condition that causes swelling of the optic nerve. It is commonly bilateral, affecting both eyes, affects both sexes equally, can occur at any age, and is most commonly caused by increased pressure in the brain. Each optic nerve transmits visual impulses from the retina and transmits the nerve impulses to the brain. The optic nerve is covered by the same protective sheath or linings that cover the brain and spinal cord. This sheath is regarded as a continuatio... Read More
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| PARENTS CHECKLIST OF VISION PROBLEMS |
PARENT S CHECKLIST OF VISION PROBLEMS
Yorkview Optometric Clinic
Dr. Robert D. Gole B.Sc.O.D
1100 Davis DriveSuites 1 & 2 NewmarketOntario L3Y 8W8 905-895-8668
PARENT S CHECKLIST OF VISION PROBLEMS
Does your child need an eye exam?
Children may not know that they have a vision problem. They can’t always tell you what they see. One out of six children have a significant eye problem that can interfere with their learning and development.&n... Read More
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| Photorefractive Keratectomy |
Photorefractive Keratectomy (PRK)
PRK (photorefractive keratectomy) involves the removal of the top surface level of the cornea called the epithelium. This exposes the inner cornea so that a cool ultraviolet laser can re-sculpt it to alter the curvature of the eye. For nearsighted peoplethe surgeon flattens the steep cornea and for farsighted people he or she makes the cornea steeper. The laser can also correct astigmatism by smoothing an i... Read More
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| Pigmentary Glaucoma |
Pigmentary Glaucoma: The Metaphor of The Bathroom Sink
A bathroom sink is a good way to illustrate the mechanics of pigmentary glaucoma. Just as the sink drain can become clogged by hair toothpasteand assorted debristhe drainage mechanism in the front of the eye can become clogged by the mechanical blockage of pigment cells that have come loose from the iris (the visible tissue that gives your eye color).
Under normal circumstancespigment is not ... Read More
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| Pigment Dispersion Syndrome |
Pigment Dispersion Syndrome
Pigment Dispersion Syndrome occurs only in certain people – generally white nearsighted males between 20-50...
Think of your iris – the coloured part of your eye – as being painted on. Now imagine something constantly rubbing against it. As time passesthe paint eventually starts to flake and chip off because of friction. This is basically what happens when you have pigment dispersion syndrome (PDS)except the fl... Read More
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| Pinguecula |
Pinguecula
There are often no symptoms of a pinguecula other than cosmetic concerns.
Overview A pinguecula (ping-gwek-u-lah) is a benign yellowish-white lesion that develops on the conjunctiva. It is a slow growth caused by the degeneration of the conjuctiva’s collagen fibres. Thicker yellow fibresor in some cases calcified depositseventually replace the fibres. A pinguecula normally grows on the nasal side of the eye and can be present in both eyes. This... Read More
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| Plaquenil Maculopathy |
Plaquenil Maculopathy
Plaquenil is an anti-inflammatory medication which helps reduce painstiffness and swelling in the joints.
Sometimes medications prescribed for certain conditions can have adverse effects on other parts of our bodies. A medication known as Plaquenil (hydroxychloroquine sulfate)which is most often used for people suffering from rheumatoid arthritislupusor malariacan have toxic effects on the eyes. Plaquenil is an anti-inflammatory med... Read More
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| Possible Laser Surgery Complications |
Complications of Laser Surgery
Complications and risks are an inherent part of any surgerydespite advanced technology and skilled professionals involved in the process. Although there is a small possibility of a serious vision complication because of laser surgeryit is important to know these risks in order to make an informed decision regarding the procedure. Rememberthe goal of laser surgery is not necessarily to eliminate the need for corrective eyewearbut to reduce a patient’s depend... Read More
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| Possible Laser Surgery Complications |
Complications of Laser Surgery
Complications and risks are an inherent part of any surgerydespite advanced technology and skilled professionals involved in the process. Although there is a small possibility of a serious vision complication because of laser surgeryit is important to know these risks in order to make an informed decision regarding the procedure. Rememberthe goal of laser surgery is not necessarily to eliminate the need for corrective eyewearbut to reduce a patient&rsquo... Read More
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| Premium IOL's |
... Read More
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| Presbyopia |
Presbyopia
When people develop presbyopiathey have the tendency to hold reading material at arm’s length...
Presbyopia (>pres-be-O-pe-ah) is a vision condition caused by the aging of the eye. It affects nearly everyone by the age of 50. The Crystalline lens of the eye thickens throughout lifemaking it harder and less flexible over time. The progressive loss of elasticity of the lens results in the eye becoming less capable of focusing on close objects. Tasks like rea... Read More
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| Presbyopia |
Presbyopia
When people develop presbyopiathey have the tendency to hold reading material at arm’s length...
Presbyopia (>pres-be-O-pe-ah) is a vision condition caused by the aging of the eye. It affects nearly everyone by the age of 50. The Crystalline lens of the eye thickens throughout lifemaking it harder and less flexible over time. The progressive loss of elasticity of the lens results in the eye becoming less capable of focusing on close objects. Tasks like ... Read More
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| Preventing AMD Through Nutrition |
Preventing AMD Through Nutrition
Overview
Age-related macular degenerationcommonly referred to as AMDis a disease in which the tissue in the macula deteriorates. The macula is located in the central part of the retina and is responsible for producing sharp central vision. The exact causes of AMD are still unknownalthough age and heredity appear to be the dominant factors. This condition can result in severely diminished central visionbut peripheral vision remains unaffected. In most casesit i... Read More
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| Protecting Your Eyes During Winter |
Prolonged exposure can take its toll on you as you age
Just like you have to wear sunglasses in the blazing heat of a summer dayyou should also be keeping your eyes away from the harmful UV rays from aboveeven when it s cold.
In case you thought that made you safe from the sun s potentially damaging raysthink again. Old Sol still presents a huge danger to you during the fall and winter monthsand in this casethe evidence is right in front of your eyes. The Canadi... Read More
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| Pseudoexfoliation Syndrome |
Pseudoexfoliation Syndrome
The main problem with pseudoexfoliation is that there is a build-up of flaky material in the angle between the cornea and iris...
Most people associate the term “exfoliation” with skinnot with the eyes. When something exfoliatesit scales off its surface in flakes or layers; we are most familiar with this happening on our arms or legs – after sunburnfor example. So picture the shedding of flakes within the eye. T... Read More
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| Pterygium |
Ptergyium
Overview
A Pterygium (teh-rij-e-um) is a benigntriangular shaped tissue growth that extends from the conjunctiva and grows onto the cornea. In 90 per cent of casesthe growth occurs on the part of the eye closest to the nose and might occur in one or in both eyes. Pterygiums are normally considered to be solely a cosmetic problemas they do not often interfere with visual acuity. Howeverin some instances they can lead to irregular astigmat... Read More
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| Ptosis (Drooping Eyelid) |
Ptosis (Drooping Eyelid)
Gravityloss of elastic tissue in the skinand weakening of connective tissues in the eyelid frequently contribute to this sagging eyelid tissue.
Ptosis refers to an upper eyelid that droops. In this conditionthe eyelid is situated over more of the eyeat times even blocking out the pupil. It may either be congenital or acquired. Most cases of age-related ptosis – called involutional – come on gradually after age 60 as par... Read More
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| Punctal Plugs |
Punctal Plugs
The entire in-office procedure is painless and usually takes only a few minutes.
As strange as it soundsjust picture a healthy eye as a full sinkwith tears (instead of water) reaching up to the rim. Dry eye syndrome (DES) occurs when your eyes fail to produce the necessary quality or quantity of tears to
protect and preserve the ocular surface. In this casethe sink would be pretty empty. Those with DES do not have a sufficient amo... Read More
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| Pupil Dilation |
Dilation
Dilating eyedrops are used for your own benefit to certify that nothing is left undiscovered during your eye examination.
Most of us are not even aware that our pupils dilate and constrict as light changes around us. The pupil regulates the amount of light that enters the eyeacting similarly to a camera shutter. In the darkyour pupil enlarges to allow more light into your eye. In the lightit decreases in size. Internal muscles contract or relax to... Read More
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