Main articles: List of eye diseases and disorders and Ocular manifestations of systemic disease There are many diseases and disorders that may affect the eyes. As the eye ages certain changes occur that can be attributed to solely the aging process. Most of these anatomic and physiologic processes follow a gradual decline. With aging, the quality of vision worsens due to reasons independent of aging eye diseases. While there are many changes of significance in the nondiseased e ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Diseases disorders and age-related changes

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Diseases disorders and age-related changes

There are many diseases and disorders that may affect the eyes. As the eye ages certain changes occur that can be attributed to solely the aging process. Most of these anatomic and physiologic processes follow a gradual decline. With aging, the quality of vision worsens due to reasons independent of aging eye diseases. While there are many changes of significance in the nondiseased eye, the most functionally important changes seem to be a reduction in pupil size and the loss of accommodation or focusing capability (presbyopia). The ar ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases, disorders, and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Diseases, disorders, and age-related changes

An eye is an organ that detects light. Different kinds of light-sensitive organs are found in a variety of creatures. The simplest eyes do nothing but detect whether the surroundings are light or dark. More complex eyes are used to provide the sense of vision. Many complex organisms including some mammals, birds, reptiles and fish have two eyes which may be placed on the same plane to be interpreted as a single three-dimensional "image" (binocular vision), as in humans; or on different planes producing two separate "images" (monocular ...

Including:

Eye - Varieties of eyes Eye - Evolution of eyes Eye - Anatomy Eye - Cytology Eye - Acuity Eye - Dynamic range Eye - Adnexa and related parts
Eye - The orbit Eye - Eyebrows Eye - Eyelids Eye - Eyelashes
Eye - Eye movement
Eye - Rapid eye movement Eye - Saccades Eye - Microsaccades Eye - Vestibulo-ocular reflex Eye - Smooth pursuit movement Eye - Optokinetic reflex Eye - Vergence movement Eye - Accommodation
Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia - Eye

Animals with compound eyes have a wide field of vision, allowing them to look in many directions. To see more, they have to move their entire head or even body. The visual system in the brain is too slow to process that information if the images are slipping across the retina at more than a few degrees per second (Westheimer and McKee, 1954). Thus, for humans to be able to see while moving, the brain must compensate for the motion of the head by turning the eyes. Another complication for vision in frontal-eyed animals is the developme ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Eye movement

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H06 Disorders of eyelid lacrimal system and orbit. (H00) Hordeolum and chalazion (H000) Hordeolum and other deep inflammation of eyelid (H001) Chalazion (H01) Other inflammation of eyelid (H010) Blepharitis (H011) Noninfectious dermatoses of eyelid (H02) Other disorders of eyelid (H020) Entropion and trichiasis of eyelid (H021) Ectropion o ...

See also:

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H59 - Diseases of the eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H06 Disorders of eyelid lacrimal system and orbit, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H10-H13 Disorders of conjunctiva, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H15-H19 Disorders of sclera and cornea, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H20-H22 Disorders of iris and ciliary body, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H25-H28 Disorders of lens, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H30-H36 Disorders of choroid and retina, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H40-H42 Glaucoma, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H43-H45 Disorders of vitreous body and globe, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H46-H48 Disorders of optic nerve and visual pathways, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H49-H52 Disorders of ocular muscles binocular movement accommodation and refraction, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H53-H54 Visual disturbances and blindness, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H55-H59 Other disorders of eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H99 - Diseases of the ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H62 Diseases of external ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H65-H75 Diseases of middle ear and mastoid, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H80-H83 Diseases of inner ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H90-H95 Other disorders of ear

Read more here: » ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process: Encyclopedia II - ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H59 - Diseases of the eye and adnexa

In most vertebrates and some mollusks the eye works by allowing light to enter it and project onto a light-sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals, which are then transmitted to the brain via the optic nerve. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye. The eyes of cepha ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Varieties of eyes

The Age-Related Eye Disease Study was a clinical trial sponsored by the National Eye Institute, one of the National Institutes of Health in the United States. The study was designed to investigate the natural history and risk factors of age-related macular degeneration (AMD) and cataracts, and evaluate the effects of high doses of antioxidants and zinc on the progression of the two conditions in those with AMD The study of 3600 individuals for an average of 6.3 years concluded that high levels of an ...

Read more here: » Age-Related Eye Disease Study: Encyclopedia - Age-Related Eye Disease Study

A disease is any abnormal condition of the body or mind that causes discomfort, dysfunction, or distress to the person affected or those in contact with the person. Sometimes the term is used broadly to include injuries, disabilities, syndromes, symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts these may be considered distinguishable categories. Pathology is the study of diseases. The subject of systematic classification of diseases is referred to as nosology. The broader bo ...

Including:

Disease - Syndromes illness and disease Disease - Transmission of disease Disease - Social significance of disease Disease - Other uses of the term

Read more here: » Disease: Encyclopedia - Disease

Disorder may refer to : A disease, in medicine Randomness (lack of order), in information theory see Types of disorders for disorder types. Other related archivesRandomness, Types of disorders, disease, information theory, medicine

Read more here: » Disorder: Encyclopedia - Disorder

In most vertebrates and some mollusks the eye works by allowing light to enter it and project onto a light-sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals, which are then transmitted to the brain via the optic nerve. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye. The eyes of cephalopods, ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Varieties of eyes

How a complex structure like the projecting eye could have evolved is often said to be a difficult question for the theory of evolution. Darwin famously treated the subject of eye evolution in his Origin of Species: To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Evolution of eyes

Bipolar disorder, still often referred to colloquially as manic-depression, is a mood disorder marked by episodes of clinically definable depression intermingled with episodes of mania and/or hypomania. Emil Kraepelin, who first described the illness, and coined the term "manic depression", noted in his original delineation of the disease intervals of acute illness, manic or depressive, that were generally punctuated by relatively symptom-free intervals in which a patient was able to ...

Including:

Bipolar disorder - Diagnostic criteria Bipolar disorder - Epidemiology Bipolar disorder - Etiology Bipolar disorder - Co-occurring conditions Bipolar disorder - Manifestations of bipolar disorder: types of episodes Bipolar disorder - Cycles in bipolar disorder Bipolar disorder - Domains of bipolar disorder
Bipolar disorder - Mania Bipolar disorder - Hypomania Bipolar disorder - Bipolar depression Bipolar disorder - Cognition
Bipolar disorder - The Mood Spectrum Bipolar disorder - Environmental factors affecting mood in bipolar disorder Bipolar disorder - Treatment of bipolar disorder
Bipolar disorder - Principles
Bipolar disorder - Prognosis
Bipolar disorder - Lithium salts Bipolar disorder - Anticonvulsant mood stabilizers Bipolar disorder - Atypical antipsychotic drugs Bipolar disorder - Omega-3 fatty acids Bipolar disorder - Psychotherapy Bipolar disorder - Electroconvulsive therapy Bipolar disorder - Medical Marijuana Bipolar disorder - Alternative treatments
Bipolar disorder - Treatment issues Bipolar disorder - Research findings
Bipolar disorder - Heritability Bipolar disorder - Recent genetic research Bipolar disorder - Medical imaging Bipolar disorder - Personality types
Bipolar disorder - Research into new treatments Bipolar disorder - Bipolar disorder and creativity Bipolar disorder - Sources

Read more here: » Bipolar disorder: Encyclopedia - Bipolar disorder

The goal of investigation is the assessment of the severity of the ocular injury with an eye to implementing a management plan as soon as is required. The usual eye examination should be attempted, and may require a topical eye anesthetic in order to be tolerable. The first step is to assess the external condition of the eye and orbit, and check for perforations, hyphema, uveal prolapse, or globe penetration. If the pupil is teardrop-shaped, and the anterior chamber is flat, this is almost always a perf ...

See also:

Eye injury, Eye injury - Investigation, Eye injury - Emergency, Eye injury - Urgent, Eye injury - Semi-urgent, Eye injury - Management, Eye injury - Irrigation, Eye injury - Patching, Eye injury - Suturing

Read more here: » Eye injury: Encyclopedia II - Eye injury - Investigation

The most common eyelid tumor is called basal cell carcinoma. This tumor can grow around the eye but rarely spreads to other parts of the body. Other types of common eyelid cancers include squamous carcinoma, sebaceous carcinoma and malignant melanoma. The most common malignant primary intraocular tumor in adults is melanoma. Though most attention is given to posterior choroidal melanoma, these tumors can also occur in the iris and ciliary body. Then they are c ...

See also:

Eye cancer, Eye cancer - Types

Read more here: » Eye cancer: Encyclopedia II - Eye cancer - Types

Eye injury - Irrigation. The first line of management for chemical injuries is usually copious irrigation of the eye with an isotonic saline or sterile water. In the cases of chemical burns, one should not try to buffer the solution, but instead dilute it with copious flushing. Eye injury - Patching. Depending on the type of ocular injury, either a pressure patch or shield patch should be applied. In most cases, such as those of corneal abrasion or the like, a pre ...

See also:

Eye injury, Eye injury - Investigation, Eye injury - Emergency, Eye injury - Urgent, Eye injury - Semi-urgent, Eye injury - Management, Eye injury - Irrigation, Eye injury - Patching, Eye injury - Suturing

Read more here: » Eye injury: Encyclopedia II - Eye injury - Management

Some signs and symptoms of red eye represent warnings that the underlying cause is serious and requires immediate attention. The person conducting a thorough eye examination should be attentive to the warning signs and symptoms during the eye exam. There are six danger signs: conjunctival injection, ciliary flush (circumcorneal injection), corneal edema or opacities, corneal staining, abnormal pupil size, and abnormally intraocular pressure. ...

See also:

Red eye medicine, Red eye medicine - Causes, Red eye medicine - Investigation, Red eye medicine - Visual acuity, Red eye medicine - Ciliary flush, Red eye medicine - Corneal opacification, Red eye medicine - Corneal epithelial disruption, Red eye medicine - Pupillary abnormalities, Red eye medicine - Shallow anterior chamber depth, Red eye medicine - Abnormal intraocular pressure, Red eye medicine - Proptosis, Red eye medicine - Important warning symptoms, Red eye medicine - Blurry vision, Red eye medicine - Severe pain, Red eye medicine - Photophobia, Red eye medicine - Coloured halos

Read more here: » Red eye medicine: Encyclopedia II - Red eye medicine - Investigation

The structure of the mammalian eye owes itself completely to the task of focusing light onto the retina. All of the individual components through which light travels within the eye before reaching the retina are transparent, minimising dimming of the light. The cornea and lens help to converge light rays to focus onto the retina. This light causes chemical changes in the photosensitive cells of the retina, the products of which trigger nerve impu ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Anatomy

Visual acuity can be measured with several different metrics. Cycles per degree (CPD) measures how much an eye can differentiate one object from another in terms of degree angles. It is essentially no different from angular resolution. To measure CPD, first draw a series of black and white lines of equal width on a grid (similar to a bar code). Next, place the observer at a distance such that the sides of the grid appear one degree apart. If the grid is 1 meter away, then the grid should be about 8.7 millimeters wide. Finally, increas ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Acuity

The retina contains two forms of photosensitive cells - rods and cones. Though structurally and metabolically similar, their function is quite different, though they are equally important to vision. Rod cells are highly sensitive to light allowing them to respond in dim light and dark conditions. These are the cells which allow humans and other animals to see by moonlight, or with very little available light (as in a dark room). However, they do not distinguish between colours, and have low visual acuity (a measure of detail). This is why th ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Cytology