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Astigmatism is an eye condition where there is an imperfection in the curvature of the cornea. The cornea and lens are smooth and equally curved in all directions, which helps to focus the light rays to the retina. But if there is an imperfection in the curvature, then you will suffer from a refractive error. Astigmatism is not an eye disease. It is simply a condition where the eye is not able to focus the light.
Irregular shape of the cornea is the main cause for astigmatism. It might also be caused because of the imperfect shape of the lens. Suffering from astigmatism is very common. You are either born with the condition or you might have developed it after an eye surgery. It is an incorrect concept that watching too much of television or reading without enough light causes astigmatism.
There are three different types of astigmatism:
- Myopic astigmatism: When the principal meridians of the cornea are nearsighted.
- Hyperopic astigmatism: When the principal meridians of the cornea are farsighted.
- Mixed astigmatism: When one of the principal meridians is nearsighted and the other is farsighted.
It can also be classified in two other types:
- Regular astigmatism: When the principal meridians are perpendicular to each other.
- Irregular astigmatism: When the principal meridians are not perpendicular to each other.
Blurry or distorted vision, strain in the eye, eye discomfort, squinting and headaches are a few symptoms of astigmatism
If you notice the symptoms stated above, make sure you pay a visit to your ophthalmologist. If you are suffering from astigmatism, your doctor will do an eye test to check how much your eye is able to focus on light. After conducting his tests, he will determine how much power you have and you will have to wear glasses of that power. Apart from the option of wearing glasses or artificial lenses, you can also go for a surgery to correct the condition. LASIK is an option among the many other options of surgeries available.
In case you have a concern or query you can always consult an expert & get answers to your questions!
Amblyopia is commonly known as 'Lazy Eye'. It is a vision development disorder, which affects eyes and the brain during infancy and childhood. It signifies that the eye does not achieve a normal visual acuity even with refractive correction in form of glasses or contact lens. During normal visual development, the eye and brain learns to 'see' and develop binocularity, that is the ability to perceive depth (Stereoacuity). This occurs in the first 8 to 10 years of life.
Each eye transmits a clear and identical image from retina to the brain, which fuses the two images into a single image with 3 dimensions ( adding depth). When the image is formed on the retina of two eyes is too dissimilar, the brain cannot fuse the two images and suppresses the more blurred image. As a result, the worse eye does not learn to 'see' and becomes 'lazy'. This condition is seen in 1-4% of population.
The common causes for dissimilar images or Amblyopia are:
1. Misalignment of the eyes or squint: It is the primary reason for Amblyopia is misalignment of the eyes. In case, both your eyes are not aimed in the same direction, the image captured by each eye is different , resulting in diplopia. The brain will see from the dominant eye and suppress image from the other eye. Over a prolonged period of time, the eye dissociates from the visual cortex of the brain.
2. Refractive Amblyopia:
- Unequal refractive error in both eye. When the eye power of both eyes differ by more than 1.5D of spherical equivalent, which results in dissimilar images between the two eyes. As a result, the visual development in restricted in the worse eye.
- High refractive error or astigmatism in both eyes, since there is a blurred image in both eyes, the normal vision development does not occur in either eyes resulting in bilateral lazy eyes.
3. Cloudiness in visual system or visual deprivation Amblyopia: Any kind of obstruction or cloudiness in the normal visual axis of the eye tissues can lead to Amblyopia. Disorder of any kind, which blocks a clear image from being focused blocks the formation of a clear image on your retina. Commonly due to congenital or developmental cataracts or corneal opacities or prolonged closure of one eye in early childhood( drooping of one eyelid, eyelid swelling, patching of one eye).
Treatment for Amblyopia: For treatment of Amblyopia, a child must be compelled to utilize his affected, weaker eye. This can be done by correction of causative factor such as, treating refractive error with glasses, surgical correction of misalignment of eyes followed by patching and vision therapy, cataract surgery.
Patching or occlusion of the good eye: This is done to force the brain to pay attention to visual input from the worse eye. This allows nerve connections between affected eye and brain to develop due to, which the eye 'learns to see'. Eye drops such as atropine are also used for blurring the vision of the good eye. Some form of vision therapy may also be required to train both eyes to see together and develop some degree of depth perception.
To be effective, treatment should be implement as early as possible , within the period of normal visual development best within first 8 years of life. Some visual gain has been seen in selected patients up to age of 14 to 18 years. This also highlights the importance of a comprehensive eye examination as a routine in young children. If you wish to discuss about any specific problem, you can consult an Ophthalmologist.
Even something as small as an eyeball, has multiple parts within it. The retina at the back of the eye ball is responsible for the clarity of vision. The central area of the retina is known as the macula. Macular degeneration is the deterioration of this part of the retina. Macular degeneration is not incurable, if detected early, the wet form of macular gegeneration can be treated very effectively by the use of drugs which are given as an injection into the eye. People suffering from macular degeneration experience blurred vision, black spots and may eventually lose central vision while retaining peripheral vision.
There are two types of macular degeneration; wet and dry. The dry form of this disease is more common than its wet form. Of these, the latter causes more serious vision loss. Dry macular degeneration leads to white or yellow deposits on the retina leading to further degeneration. In the wet form of this disease, blood vessels beneath the retina start growing towards the macula and may pull it away from the base when they break or leak fluid.
There are three stages of age related macular degeneration (AMD).
- Early AMD
This is diagnosed by the presence of deposits on the retina. In most cases, ether is no vision loss at this stage but regular check-ups are essential.
- Intermediate AMD
A comprehensive eye exam will show the presence of larger deposits or pigment changes in the retina. At this stage, slight vision loss may be experienced.
- Late AMD
People suffering from late AMD have noticeable vision loss.
Though this disease is linked to aging, the exact triggers for macular degeneration are unknown. It is understood to be a combination of hereditary and environmental factors. The presence of certain genes and their variants has been associated with a number of cases of this disease. Studies also show that caucasions are at the highest risk of suffering from this disease. Depriving cells in the retina of oxygen can also increase a person's risk of contacting this disease. Other risk factors for this disease are obesity, smoking, high blood pressure and a light eye colour. The side effects of certain drugs can also induce this condition.
Macular degeneration is considered to be incurable but certain forms of treatment can improve vision and slow down the rate of deterioration. Treatment prescribed by a doctor depends on stage of the disease and whether it is wet or dry. Studies suggest that a diet rich in omega 3 fatty acids can prevent AMD and lower the risk of its progression. Consult an Expert & get answers to your questions!
You never tend to pay a lot of attention to your eyes unless they are affected by some serious disorder or unless your vision is disrupted. But did you know that your eyes are capable of doing much more than you can imagine? here are 10 surprising facts about your eyes you didn't know about.
1. How intricate!
Your eyes take more than 2 million working parts to function. No wonder your eyes are the second most complex organ of your body after your brain.
2. A lot depends on them
As much as 80% of your memories are determined by what you see. Also, 80% of what you learn is because of your eyes.
3. Retina and security
The iris of your eyes has approximately 256 unique characteristics, which is more than even your fingerprints. This is the reason why retina scans are used so widely today for security purposes.
4. It's a colourful world
Your eyes can distinguish between approximately 10 million different colours. And women with a particular kind of genetic mutation can see millions of more colours.
The retina of your eyes receives the vision of the outside world as upside down. It is your brain, which flips the image for you so that you can see the world as it is.
6. Sunscreen for the eyes?
It is possible for your eyes to get sunburnt. Therefore, it is advisable for you to wear sunglasses in order to protect your eyes from the ultraviolet radiations.
The eye muscle is the muscle that reacts at the fastest rate out of all the other muscles in your body. It can contract in less than even 1/100th of a second.
8. Paint it red?
The retina of your eyes cannot detect the red colour. The retinas do have green, red and blue receptors, but the red receptor can detect only the colour yellow-green and the green one can recognise blue-green. It is your brain that combines these signals to give you the impression of the colour red.
9. Dreams and sight
Even if you become blind later in life, you can see images in your dreams if you were born with sight.
10. We are blink-eyed peas
You blink approximately 17 times every minute. That makes it 5.2 million times in a year. If you wish to discuss about any specific problem, you can consult an Ophthalmologist.
Have pressure in eyes. GOT CHECK UP DONE. FINE. EYE DROPS -NEPALACT and ALPHAGAN Z. STILL PERSISTING. Vision Perfect. PLadvise.
I have a family history of Glaucoma I have high myopia I have -14 number in both eyes I have thin retina due to which I see black spots in front of my eyes and also linings. Now my eye specialist told me to have check for Glaucoma as during her observation she suspected POAG but I have undergone through few tests like CCT and OCT and after seeing the report doctor said the reports are ok but still she needs reports one more test and that is humphrey visual fields afterwards she will be able to tell me whether I shud start medicine or not. I am confused and afraid right now whether I will loose my vision or am I safe. Please assist after considering all my problems.
My mother have diabetes from past 12 years, also have diabetic retinopathy since 3 years, hypertension since 4 years .the reports came abnormal so please tell the advice and prescription.
Is it 100% safe to eye surgery for remove specs? Because my eye doctor wear specs and also advice for remove specs by laser. I am afraid of if fail what is the disadvantages? (my number is now stable)
My mother is facing an eye problem. Her right eye pupil expand and contract time to time some time it expands so much. Which cause her headache. I had gone through checkup. Dr. Told it is sign of glaucoma and due to eye pressure it happened. They Done laser operation by telling that it is glaucoma initial stage. For a month she was alright but again she is facing same problem.
Every person with diabetes, should get their retina (the film at the back of the eye) checked once a year. This is irrespective of whether you think your diabetes is 'mild' or 'under control', as even newly diagnosed diabetics can have retinal changes (diabetic retinopathy). You will not notice any changes in your vision until the condition is advanced. If diagnosed early, this can be treated without significant damage to your vision. So, it is important to make an annual retinal check a routine part of your life if you have diabetes. Examination is done after putting in drops to dilate your pupils and is ideally accompanied by photographing the back of your eye to document any changes, so any progression can be monitored and treated early if required.