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Oculus Eye Clinic

Kolkata, West Bengal
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Oculus Eye Clinic - Nursing Homes / Clinics / Hospitals of glaucoma surgery, hypertensive retinopathy & refractive errors in Kolkata, West Bengal.

Glaucoma Surgery
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Glaucoma Surgery

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Optic nerve is a bundle of nerve fibers that carries signals from the retina of the eye to the brain which are processed as images. Damage to the optic nerve cannot be reversed. Hence, there is no cure for glaucoma as the lost vision cannot be restored. However, early diagnosis and detection can preserve your vision and prevent vision loss.
  • Primary Open-angle glaucoma: This happens when the meshwork at the drainage angle is unable to drain the aqueous humor effectively. There are no symptoms to begin with except blank or black spots in the vision. However, by the time blank spots become evident in day-to-day activities, there has been considerable damage to the optic nerve. The damage to optic nerve occurs at different IOPs for different individuals. Your ophthalmologist or eye specialist will determine your target IOP and help your maintain it. Often raised IOPs are missed at the first eye pressure testing. However, routine eye pressure testing by trained ophthalmologist can often diagnose this early.

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Hypertensive Retinopathy
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Hypertensive Retinopathy

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The term hypertensive retinopathy described the damage caused to the retinal blood vessels due to long term high blood pressure. The retina is the light sensitive layer at the back of the eye that is responsible for vision. With damage to the retina, hypertensive retinopathy can severely damage vision causing even loss of sight.

Vision is determined by the ability of the retina to receive the light signals and convert it into electrochemical signals that are transmitted to the brain via the optic nerve. The retina is a layer of highly sensitive cells that are rich in blood supply and nerves.


Retina and blood pressure

Retinal blood vessel changes depends on two major factors –

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Refractive Errors
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Refractive Errors

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Refractive errors affect a large population worldwide and account for half the cases of avoidable vision impairment in over 153 million persons globally. If these errors are not detected and corrected early they may adversely affect development of the eye, academic and social performance. Over the age of 50 years, refractive errors are responsible for accidents, social and emotional problems. Around two thirds of all vision impairment in developed nations is due to refractive errors and their under-correction.


Vision and refraction

The eye receives light from the outside world and as it falls on the retina or the light sensitive layer at the back of the eye, we process the image in our brain. This is the basis of normal vision. There are two parts of this function –

  • The light rays need to be correctly focused on to the back of the eye or the retina
  • The information on the retina needs to be converted to electrochemical signals by the cells and then transmitted to the brain via the optic nerve

For normal vision and depth of the picture both eyes need to function correctly for perception of a single vivid image.

Refraction is a term used in optical physics to describe the bending of light rays as they pass across a particular medium. In natural eye the light rays pass through the transparent cornea and then through the biconvex lens. The lens has a power that means its capability to focus parallel rays of light. The higher this value measured in dioptres (D), the stronger is its focusing ability. Refraction is also caused by a small extent on the air/tear interface on the surface of the cornea and the cornea itself.

The accommodative response is the response of the eye muscles to alter the shape of the lens for allowing projection of an image onto the retina.

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Uveitis Surgery
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Uveitis Surgery

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The uvea lies between the whites of the eye or the sclera and the retina. The uvea is supplied richly by blood vessels and is deeply pigmented. The choroid layer (choroid plexus, ciliary body and iris together) is also termed as uveal tract.

The term uveitis refers to inflammation at any point of the uveal tract with or without inflammation of neighbouring structures like the retina at the back of the eye or the vitreous humor or the liquid that fills the inner part of the eye ball.


There are several types of classifications of uveitis. The commonest classification is by the anatomical location of the inflammation. This includes :

  • Anterior uveitis – This type of uveitis affects the iris and is also called iritis. It may also be referred to as iridocyclitis because it may affect the iris as well as the ciliary body.
  • Intermediate uveitis – This type affects the vitreous humor and the back part of the ciliary body.
  • Posterior uveitis – This type affects the choroid or back part of the uvea. It is also called choroiditis if only choroid is affected or chorioretinitis if there is involvement of the retina as well.
  • Panuveitis – This type refers to inflammation throughout the uvea.

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Endophthalmitis Surgery
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Endophthalmitis Surgery

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Symptoms of diabetes developing during pregnancy are classified under gestational diabetes. Like other types of diabetes, gestational diabetes affects how your cells use sugar (glucose) — your body's main fuel. Gestational diabetes causes high blood sugar that can affect your pregnancy and your baby's health.

Complications from pregnancy can be alarming, but there's good news. Expectant moms can help control gestational diabetes by eating healthy foods, exercising and, if necessary, using medication. Taking good care of yourself can ensure a healthy pregnancy for you and a healthy start for your baby.

Blood sugar usually returns to normal soon after delivery in gestational diabetes. But if you've had gestational diabetes, you're at risk for future type 2 diabetes. You'll continue working with your health care team to monitor and manage your blood sugar.

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Cataract Surgery
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Cataract Surgery

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A cataract is a condition where the lens of the eye loses its clarity, becomes clouded and affects vision. Clouding causes the lens to become yellowish-brown in color.

Lens is a transparent structure that lies behind the iris and the pupil and works like the lens of a camera. It helps focus light on the retina (light sensitive tissue at the back of the eye) to form an image. In normal condition since the lens is clear, you see a sharp image of the objects around you. In cataract, since the lens is not clear, the images you see are blurred. Most cataracts occur in older people and are age related. Cataract can affect one or both eye but it cannot spread from one eye to another.

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Age Related Macular Degeneration
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Age related macular degeneration or AMD is an eye condition that occurs with aging. There are usually no obvious causes for this condition. However AMD affects the macula severely after the age of 50 leading to vision loss.

The retina and the macula

The retina is a curtain of cells that line the back of the eye. It is made up of special light sensitive cells called rods and cones. Light enters the eyes and passes through the lens which focuses the light on to the retina. The light causes electrochemical changes in the retinal cells leading to stimulation of the nerve cells supplying the retina. These nerve cells via the optic nerve carry the visual information to the brain that allows us to see an image. The retina contains the retinal pigment epithelium (RPE), the rods and cone cells and an inner lining Bruch's membrane.

The macula is the small part or spot that lies near the centre of the retina. The macula is where the vision is focused and is the best point of vision. The central and most important part of the macula is called the fovea. The outer part of the retina is responsible for peripheral vision.

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About Us

Oculus Eye Clinic - Nursing Homes / Clinics / Hospitals of glaucoma surgery, hypertensive retinopathy & refractive errors in Kolkata, West Bengal.

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Nursing Homes / Clinics / Hospitals

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Oculus Eye ClinicP26/B, Nonigopal Roy Choudhury Avenue , Entally, CIT Road, Near SBI bank, Kolkata, Near SBI Bank,
Kolkata-700014, West Bengal, India

Dr. Subhasish Nag (MBBS DO MS)

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