Medical dictionary

What is corneal dystrophy? Corneal dystrophies are a group of over twenty genetic conditions which affect the cornea, the front part of the eye. The cornea is made up of five layers and they must be clear in order for you to see well. Water, nutrients and other matter usually pass through these layers but in the case of corneal dystrophies, one or more of these layers becomes water-logged and a

What is a corneal transplant? A corneal transplant, also called keratoplasty, is the total or partial replacement of the cornea, which is the transparent external lens located in the front of the eye, which is responsible for our vision. This is one of the most common transplants, in which the cornea of a recently deceased donor is used, whose eyes have been tested to ensure that they are su

What is a corneal ulcer? A corneal ulcer is an open ulcer that is found in the outer layer of the cornea. If the corneal ulcer is not treated, it can lead to the appearance of scars on the cornea, to a considerable loss of vision or even to the loss of the eye. Corneal ulcers are treated by ophthalmologists.  What are the symptoms of a corneal ulcer? The main symptoms are:

What is a coronavirus? Coronaviruses are a large family of viruses that cause mild to moderate upper-respiratory illnesses ranging from the common cold to more severe illnesses such as pneumonia, severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). Almost everyone will get infected by a coronavirus at least once in their life, and most of the time t

What is dacryocystorhinostomy? Dacryocystorhinostomy (DCR) is a surgical procedure that aims to restore the drainage of tears from the eye when the tear ducts are blocked. Tears are produced to keep the eyes clean and moist. More tears are produced in response to cold, wind, smoke, injuries to the eye, or something in the eye (e.g. grit, an eyelash, etc.). Normally, tears drain from the

What is dark circle treatment? Dark circles (technically known as idiopathic cutaneous hyperchromia of the orbital region) refer to the darkest area under the eyes. They can be hereditary, caused by hyperpigmentation, shadows, allergies, asthma, or eczema or be due to medication, fatigue, sadness, hormonal changes, age or nutritional deficiency. Dark circle treatment is a highly effecti

What are dermal fillers? Dermal fillers are one of the most popular treatments used in cosmetic surgery in this day and age, due to the pleasing results they offer without the need to undergo a surgical intervention. The results are achieved by non-invasive techniques, with no risks or secondary effects. The fillers are used to eliminate wrinkles and deep facial folds, volume replenishme

What is diabetic retinopathy? Diabetic retinopathy is a complication of diabetes that affects the eye and can severely damage vision, even causing blindness if left untreated. The retina is the layer of cells on the back wall of the inside of the eye. These cells, known as photoreceptor cells, are light-sensitive and can be divided into cones and rods. Light enters through the front of the e

What is diplopia? Diplopia, also called double vision, is an eye condition in which the images perceived by the eyes are not processed in the brain as a single spatial image, and instead, the brain sees two images. Depending on its origin, it can be of two types: binocular: the most common type, where the eyes do not line up with each other correctly. It is usually related to strabismus.