Eye World Clinic

16/03/2017

Are you properly cleaning and storing your soft contact lenses?

13/03/2017

function of blind spot

Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area. The blind spot of the right eye is located to the right of the centre of vision and vice versa in the left eye. With both eyes open, the blind spots are not perceived because the visual fields of the two eyes overlap. Indeed, even with one eye closed, the blind spot can be difficult to detect subjectively because of the ability of the brain to “fill in” or ignore the missing portion of the image.

The optic disk can be seen in the back of the eye with an ophthalmoscope. It is located on the nasal side of the macula lutea, is oval in shape, and is approximately 1.5 mm (0.06 inch) in diameter. It is also the entry point into the eye for major blood vessels that serve the retina. The optic disk represents the beginning of the optic nerve (second cranial nerve) and the point where axons from over one million retinal ganglion cells coalesce. Clinical evaluation of the optic nerve head is critical in the diagnosis and monitoring of glaucoma and other optic neuropathies that may lead to vision loss.

13/03/2017

Tear Drainage System (Lacrimal System)

The tear drain consists of two small openings called the puncta, one in your upper and the other in your lower eyelid. Each of these openings lead into a small tube called a canaliculus which, in turn, empties into the tear sac at the inside corner of your eye along your nose. An opening into the lacrimal sac leads into a canal called the nasolacrimal duct which passes through the bony structures surrounding your nose and empties tears into your nasal cavity

How does the tear drain work?

The tears pass through the lacrimal drainage system by blinking and the principle of capillary action. When blinking, your lids push tears evenly across your eyes to keep your eyes moist and healthy. Blinking also pumps tears into the puncta and by capillary action they are drawn into the lacrimal sac which travels through the tear duct and drains into your nose. If the tear duct is blocked or the capillary action of the tears is not working, your tears back up and spill over your eyelids as if you are crying. Tears trapped in the tear sac also become stagnant and infected like a pond in the forest when the water has sat there for a period of time.

What are the symptoms of having a plugged tear drain?

Many times the symptoms revolve around an infected tear sac and duct. The most common symptoms of this are excessive watering, mucous discharge, eye irritation, and a painful swelling in the inner corner of your eyelid. If the symptoms go untreated, infection can develop around the entire area of your eye.

13/03/2017

PXS vs PXF glaucoma.

10/03/2017

10/03/2017

Contact lens wearers: Don't let an eye infection ruin your vacation time!

09/03/2017

March is Workplace Eye Wellness Month! Find out how to set up your cubicle to minimize eye strain, headaches, and dryness.http://bit.ly/2m0ogCA

08/03/2017

Are marijuana’s effects on vision good or bad? Two new studies suggest there isn’t one easy answer, and neither one considers long-term impacts. http://bit.ly/2lfjQuI

04/03/2017

What impact does VR gear have on the eyes? While the technology is relatively new and no long-term studies have been done, there are a few things we do know.http://bit.ly/2lZ1FGR

02/03/2017

Yes. Your child's eyes need protection from the sun's UV rays, but it's all about getting the right pair of sunglasses.

01/03/2017

About the LASIK experience: before, during and after laser eye surgery

28/02/2017

Ever had an eyelid that wouldn't stop twitching? Share this infographic on causes and remedies.