glaucoma

Written by: Prof. Kent Caslo, Professional Director of ELIA, Developmental Optometrist. Causes increased intraocular pressure causing damage to the optic nerve and damage to the visual field. Impact on vision: Reduction and damage to the peripheral field of vision. A typical injury usually begins on the perimeter and continues in the form of a spiral […]

strabismus

Written by: Prof. Kent Caslo, Professional Director of ELIA, Developmental Optometrist. Strabble What is squinting: Strabismus is a condition in which two eyes are not aimed at the same target. There will always be one eye focused on the purpose of the vision but the other eye will not. Most strabismus cases are in the […]

Lazy eye Amblyopia

definition: A lazy eye is a visual impairment characterized by a decrease in the quality of vision of one eye, when there is no active disease (if there was a disease it has already been treated) and without the ability to improve the quality of vision with glasses. In order to see, cooperation between the […]

The visual system concepts and definitions

Prof. Kent Caslow, Elia Professional Director. Eye structure  corneaCornea Transparent dome-like structure The first and outer layer of the eye Transmits light rays from the object into the eye Iris –Iris Located behind the cornea and in front of the lens. Gives the characteristic color to the eye In the center is the pupil. Responsible […]

Nystagmus

definition: Nystagmus (flickering eyes) is a disorder characterized by involuntary movements of the eyes – jitter from side to side, from top to bottom or in rotations. Nystagmus usually appears in both eyes, but sometimes only one eye can be injured. The main cause of nystagmus is decreased vision in early childhood for various reasons […]

Cataract (poor) from birth

definition: Cataract (poor) is a visual impairment, in which the lens of the eye is cloudy, while in normal condition it is transparent and won. The lens is located behind the iris, and its job is to focus the light rays on the retina. The retina is an inner layer located at the back of […]

Cortical visual impairment

definition: Visual impairment on a cortical background is a neurological impairment, and the damage is cerebral rather than ocular. It is a temporary or permanent condition created as a result of impaired nerve conduction to the visual center, causing difficulties and inconsistencies in the procedures for absorbing, processing and deciphering visual information. The degree of […]

Cone-Rod Dystrophy

Congenital genetic-hereditary phenomenon. Disease incidence 1: 40,000 births. The retina is the part of the eye that absorbs light. It consists of two types of receptors, which are the cells that receive light and convert the image into electrical signals that pass to the brain. There are 2 types of receptors: 1. Rods 2. Cones. […]

albinism

Written by: Prof. Kent Caslo, Professional Director of ELIA, Developmental Optometrist. General background Albinism is an inherited congenital disease, characterized by a complete or partial deficiency of a pigment (a colored substance called melanin) that appears on the skin, hair and eyes. There are two main types of albinism; For ocular albinism (lack of pigment […]

Coloboma

Written by: Prof. Kent Caslo, Professional Director of ELIA, Developmental Optometrist. BackgroundIn the fourth week of pregnancy the eyes begin to develop in stages. In the first stage, fibers from the fetal brain are pulled forward to create what will become the eyeball. This shape is reminiscent of a cup, which will close over time […]