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Eye Conditions

There are 6 main types of eye conditions, all of which are treatable, for which Allon Barsam carries out specialist evaluation and treatments. In many cases patients will have more than one of these eye conditions and the treatments can simultaneously correct more than one problem at once. The conditions are outlined below:
Allon Barsam - eye conditions specialist


Also know as near-sightedness or short-sightedness, this eye condition occurs where a patient’s eye is either too long or the cornea is too curved or a combination of the two resulting in light being focused in front of the retina at the back of the eye instead of to a sharp focus onto the retina. Myopia can either be mild, moderate or severe (high myopia).


Also known as hyperopia, far-sightedness or long-sightedness, this condition occurs where a patient’s eye is either too short or the cornea is too flat or a combination of the two resulting in light being focused behind the retina at the back of the eye instead of to a sharp focus onto the retina. Hypermetropia can either be mild, moderate or severe (high hypermetropia).


This is a condition of the eye where the cornea is shaped like a rugby ball rather than like a football, so that in one meridian the cornea is too steep. It normally occurs in combination with myopia or hypermetropia. Astigmatism results in light being focused at 2 separate points, so that at all distances the vision is blurred.


This is an age-related eye condition where the focusing power of the eye for near objects becomes less. It occurs because the lens in the eye becomes stiffer and less able to bend it’s shape, and also because the muscles that cause the lens to change shape become weaker with age. Presbyopia normally comes on when people are in their 40s and gets progressively worse until people are 65 years old.


Cataracts are associated with ageing and some lens changes are inevitable in older people, particularly those aged over 60. Cataracts are cloudy formations inside the eye’s lens which create blurred vision and increasing short-sightedness.

Medical conditions such as diabetes can cause cataracts, as can the use of steroids. Cataracts can occur alongside other eye conditions, and are treated relatively easily through a tried and tested surgical procedure by a specialist surgeon.


Corneal Disease

The healthy cornea is the clear natural contact lens at the front of the eye through which the coloured iris is visible beneath. Next to the cornea is the conjunctiva which covers the surface of the eye, the inside of the eyelids and ends at the eyelid margin where the meibomian glands (oil ducts) of the eyelid are found.

Mr Barsam specialises in the diagnosis and treatment of these eye conditions, including diseases such as: Keratoconus, Fuchs endothelial dystrophy, Corneal scarring, complications of contact lens wear, microbial keratitis (contact lens induced corneal infection), blepharitis, dry eyes and pterygium.

Allon Barsam carries out 3 broad types of complementary surgical procedures for eye conditions:

1 Procedures for vision correction such as laser eye surgery, implantable contact lenses or refractive lens exchange to give patients permanent independence from glasses and contact lenses.

2 Advanced Cataract Surgery (including laser cataract surgery) with premium intraocular lenses such as multifocal intraocular lenses and toric intraocular lenses.

3 Procedures for patients with ocular surface or corneal disease such as corneal transplant surgery for keratoconus or Fuchs Corneal Dystrophy.

Mr Barsam also sees patients with corneal disease who may not need surgery, such as those suffering from eye conditions and complications associated with contact lenses, blepharitis or dry eyes.