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  • Disease

    Blepharitis

    The eye is the organ of sight, a nearly spherical hollow globe filled with fluids (humors). The outer layer or tunic (sclera, or white, and cornea) is fibrous and protective. The middle tunic layer (choroid, ciliary body and the iris) is vascular. The innermost layer (the retina) is nervous or sensory. The fluids in the eye are divided by the lens into the vitreous humor (behind the lens) and the aqueous humor (in front of the lens). The lens itself is flexible and suspended by ligaments which allow it to change shape to focus light on the retina, which is composed of sensory neurons.

    Blepharitis is swelling or inflammation of the eyelids, usually where the eyelash hair follicles are located.

  • Symptoms

    Blindness and vision loss

    This X-ray shows the skull of a child with neurofibromatosis (NF-1). This child developed visual difficulties and was discovered to have a glioma (nerve tumor) in the optic nerve. The tumor has enlarged the bony opening (optic foramen), through which the optic nerve passes. This can be seen on the right side of picture.

    Blindness is a lack of vision. It may also refer to a loss of vision that cannot be corrected with glasses or contact lenses. Partial blindness means you...

  • Disease

    Blocked tear duct

    Blocked tear duct

    A blocked tear duct is a partial or complete blockage in the pathway that carries tears from the surface of the eye into the nose.