Diagnostic Tests for Red-green color blindness
Red-green color blindness Tests: Book Excerpts
Home Diagnostic Testing
These home medical tests may be relevant to Red-green color blindness:
- Vision & Eye Health: Home Testing:
Red-green color blindness Diagnosis: Book Excerpts
Diagnostic Tests for Red-green color blindness: Online Medical Books
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for more information about the diagnostic tests for Red-green color blindness.
BLINDNESS:
DIAGNOSTIC WORKUP
(Algorithmic Diagnosis of Symptoms and Signs)
Referral to an ophthalmologist is usually the first step in a good workup. If one is not available, a careful eye examination including slit lamp examination, visual acuity evaluation, tonometry, and visual field studies should be done. If these are unrevealing, a referral to an ophthalmologist or neurologist should be made without further delay. Additional studies would include a CT scan or MRI of the brain and orbits, carotid scans, spinal tap, VEP studies, and four-vessel cerebral angiography. An EEG would be useful in diagnosing hysterical blindness and malingering.
» READ BOOK EXCERPT ONLINE »
Source: Algorithmic Diagnosis of Symptoms and Signs, 2003
Vision loss:
History and physical examination
(Handbook of Signs & Symptoms (Third Edition))
Sudden vision loss can signal an ocular emergency. (See Managing sudden vision loss.) Don’t touch the eye if the patient has perforating or penetrating ocular trauma.
If the patient’s vision loss occurred gradually, ask him if the vision loss affects one eye or both and all or only part of the visual field. Is the visual loss transient or persistent? Did the visual loss occur abruptly, or did it develop over hours, days, or weeks? What is the patient’s age? Ask the patient if he has experienced photosensitivity, and ask him about the location, intensity, and duration of any eye pain. You should also obtain an ocular history and a family history of eye problems or systemic diseases that may lead to eye problems, such as hypertension; diabetes mellitus; thyroid, rheumatic, or vascular disease; infections; and cancer.
The first step in performing the eye examination is to assess visual acuity, with best available correction in each eye. (See Testing visual acuity, page 630.)
Carefully inspect both eyes, noting edema, foreign bodies, drainage, or conjunctival or scleral redness. Observe whether lid closure is complete or incomplete, and check for ptosis. Using a flashlight, examine the cornea and iris for scars, irregularities, and foreign bodies. Observe the size, shape, and color of the pupils, and test the direct and consensual light reflex (See “Pupils, nonreactive,” page 521.) and the effect of accommodation. Evaluate extraocular muscle function by testing the six cardinal fields of gaze. (See Testing extraocular muscles, page 206.)
» READ BOOK EXCERPT ONLINE »
Source: Handbook of Signs & Symptoms (Third Edition), 2006
Vision loss:
History and physical examination
(Professional Guide to Signs & Symptoms (Fifth Edition))
Sudden vision loss can signal an ocular emergency. Don’t touch the eye if the patient has a perforating or penetrating ocular trauma. (See Managing sudden vision loss, page 802.)
If the patient’s vision loss occurred gradually, ask him if it affects one eye or both and all or only part of the visual field. Is the vision loss transient or persistent? Did it occur abruptly or develop over hours, days, or weeks? What is the patient’s age? Ask the patient if he has experienced photosensitivity, and ask about the location, intensity, and duration of any eye pain. Also, obtain an ocular history and a family history of eye problems or systemic diseases that may lead to eye problems, such as hypertension; diabetes mellitus; thyroid, rheumatic, or vascular disease; infections; and cancer.
The first step in performing the eye examination is to assess visual acuity with the best available correction in each eye. (See Testing visual acuity, page 803.)
Carefully inspect both eyes, noting edema, foreign bodies, drainage, or conjunctival or scleral redness. Observe whether lid closure is complete or incomplete, and check for ptosis. Using a flashlight, examine the cornea and iris for scars, irregularities, and foreign bodies. Observe the size, shape, and color of the pupils, and test the direct and consensual light reflex (see “Pupils, nonreactive,” page 654) and the effect of accommodation. Evaluate extraocular muscle function by testing the six cardinal fields of gaze. (See Testing extraocular muscles, page 246.)
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006
Night blindness [Nyctalopia]:
History and physical examination
(Professional Guide to Signs & Symptoms (Fifth Edition))
If the patient complains of difficulty seeing at night, ask when he first noticed the problem. Is it intermittent or steadily worsening? Is it worse at certain times or in certain conditions? Also, ask about other ocular symptoms, such as eye pain, blurred or halo vision, floaters or spots, and photophobia.
Explore any history of glaucoma, cataracts, and familial degeneration of vision. If no ocular problems are apparent, briefly evaluate the patient’s nutritional status for vitamin A deficiency.
Examine the eyes for ptosis, abnormal tearing, discharge, and conjunctival injection. Test visual acuity and visual fields in both eyes and, if trained and equipped, measure intraocular pressure. Check pupillary response, and evaluate extraocular muscle function by testing the six cardinal fields of gaze.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Signs & Symptoms (Fifth Edition), 2006
Vision loss:
Physical assessment
(Signs & Symptoms: A 2-in-1 Reference for Nurses)
Don’t touch the patient’s eye if he has perforating or penetrating ocular trauma. The first step in performing the eye examination is to assess visual acuity, with best available correction in each eye. (See Testing visual acuity, page 691.)
Carefully inspect both eyes, noting edema, foreign bodies, drainage, or conjunctival or scleral redness. Observe whether lid closure is complete or incomplete, and check for ptosis. Using a flashlight, examine the cornea and iris for scars, irregularities, and foreign bodies. Observe the size, shape, and color of the pupils, and test the direct and consensual light reflex (see “Pupils, nonreactive,” page 551) and the effect of accommodation. Evaluate extraocular muscle function by testing the six cardinal fields of gaze.
» READ BOOK EXCERPT ONLINE »
Source: Signs & Symptoms: A 2-in-1 Reference for Nurses, 2007
Night blindness:
Physical assessment
(Signs & Symptoms: A 2-in-1 Reference for Nurses)
Examine the eyes for ptosis, abnormal tearing, discharge, and conjunctival injection. Test visual acuity and visual fields in both eyes and, if trained and equipped, measure intraocular pressure. Check pupillary response, and evaluate extraocular muscle function by testing the six cardinal fields of gaze.
» READ BOOK EXCERPT ONLINE »
Source: Signs & Symptoms: A 2-in-1 Reference for Nurses, 2007
Vision loss:
History and physical examination
(Nursing: Interpreting Signs and Symptoms)
Sudden vision loss can signal an ocular emergency. (See Managing sudden vision loss, page 628.) Don't touch the eye if the patient has perforating or penetrating ocular trauma.
If the patient's vision loss occurred gradually, ask him if the vision loss affects one eye or both and all or only part of the visual field. Is the visual loss transient or persistent? Did the vision loss occur abruptly or did it develop over hours, days, or weeks? What's the patient's age? Ask the patient if he has experienced photosensitivity and ask him about the location, intensity, and duration of eye pain. You should also obtain an ocular history and a family history of eye problems or systemic diseases that may lead to eye problems, such as hypertension; diabetes mellitus; thyroid, rheumatic, or vascular disease; infections; and cancer.
The first step in performing an eye examination is to assess visual acuity, with best available correction in each eye. (See Testing visual acuity, page 629.)
Carefully inspect both eyes, noting edema, foreign bodies, drainage, or conjunctival or scleral redness. Observe whether lid closure is complete or incomplete and check for ptosis. Using a flashlight, examine the cornea and iris for scars, irregularities, and foreign bodies. Observe the size, shape, and color of the pupils, and test the direct and consensual light reflex (See “Pupils, nonreactive,” page 515.) and the effect of accommodation. Evaluate extraocular muscle function by testing the six cardinal fields of gaze. (See Testing extraocular muscles, page 197.)
» READ BOOK EXCERPT ONLINE »
Source: Nursing: Interpreting Signs and Symptoms, 2007
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