What is the medical term for poor eyesight?
Glossary of Eye Terms. Amblyopia Dullness or obscurity of sight for no apparent organic reason, therefore not correctable with glasses or surgery. Sometimes called a lazy eye, wherein one eye becomes dependent on the other eye to focus, usually developed in early childhood. Often associated with strabismus.
Do you know these common ophthalmology terms?
If so, you have come to the right place. Here, the knowledgeable team at King LASIK shares the definitions of some common ophthalmology terms that you may not be familiar with. Age-Related Macular Degeneration – AMD, as the condition is often referred to, is the deterioration of the eye’s macula (a small area of the retina).
What does amblyopia mean in medical terms?
Amblyopia is the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly. The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye.
What is the medical term for rhythmic motion of eye?
The medical word for rhythmic motions of the eye, particularly when looking to the side, is: nystagmus. An ophthalmologist or optometrist assesses and measures a patient for eyeglass lens or contact lenses using a device called a/an: phorometer.
What is aphakia of the eye?
Aphakia means not having a lens inside your eye. The lens is the clear, oval-shaped structure behind the iris (colored part of your eye) and pupil. It focuses light rays on the retina.
What is aphakia and Pseudophakia?
Etiology. Aphakic glaucoma is referred to a condition that is a known complication which follow congenital cataract surgery in children. Pseudophakic glaucoma refers to the glaucoma following implantation of the lens with cataract surgery.
What happens if the lens is removed?
Once the natural lens in the eye has been removed, the eye loses its ability to focus light and images clearly on to the retina, the light-sensitive tissue that lines the inside surface of the eye.
What does the eye see without a lens?
A human eye without the lens can see UV light like some animals, birds and bees. It makes the world seem different but also unveils some of the concealed secrets of nature.
What does a person with aphakia see?
Even with the lens removed (a condition known as aphakia) the patient can still see, as the lens is only responsible for about 30% of the eyes' focusing power. However, aphakic patients report that the process has an unusual side effect: they can see ultraviolet light.
How do people with aphakia see?
Aphakia also causes loss of accommodation, meaning that the eye cannot maintain its focus on an object as that object moves closer or farther away. Other vision changes you may notice include erythropsia, in which objects appear reddish, and cyanopsia, in which everything appears to have a blue tint.
Can lens fall out after cataract surgery?
Dislocated Lens Symptoms and Diagnosis Sudden vision loss after cataract surgery may indicate that the lens implant has fallen out of position. Having a cataract lens implant dislocate is an increasingly common occurrence, especially as patients receive cataract surgery at younger ages.
Do they remove your lens in cataract surgery?
During cataract surgery, the clouded lens is removed, and a clear artificial lens is usually implanted. In some cases, however, a cataract may be removed without implanting an artificial lens. Surgical methods used to remove cataracts include: Using an ultrasound probe to break up the lens for removal.
How long does the lens last after cataract surgery?
The lens that the surgeon implants during cataract surgery is durable and will last a lifetime, according to Mayo Clinic. Sometimes the capsule that holds the lens can become cloudy, and the National Eye Institute calls it an “after-cataract.” If you have an after-cataract, a laser is used to correct the cloudiness.
What causes aphakia?
Causes of aphakia They are the result of the clumping together of proteins on the lens and are common as people age. Although older adults have the highest incidence of cataracts by far, babies can be born with the disease, either because of genetics or exposure to an illness such as chickenpox.
What happens if you damage the lens in your eye?
The amount of blurring depends on the extent of the detachment and dislocation. A partially detached lens may not cause any symptoms. When the ligaments that support the lens are damaged, the iris (the circular structure that gives the eye its color) also may lose support and may quiver.
What is anisometropia?
Anisometropia is a condition where the refractive error differs between the two eyes. A difference in spherical equivalent refraction (SER) of 1 diopter or more (SER difference ≥ 1.00 D) is usually used as the definition for anisometropia.
What causes Aphakia?
Causes of aphakia They are the result of the clumping together of proteins on the lens and are common as people age. Although older adults have the highest incidence of cataracts by far, babies can be born with the disease, either because of genetics or exposure to an illness such as chickenpox.
How do you get pseudophakia?
Pseudophakia often occurs during cataract surgery. A cataract causes clouding or blurring of the lens in a person's eye and is a common condition often related to aging.
How is pseudophakia different?
1:074:53Phakia Pseudophakia and Aphakia - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo in a one eye the patient is having cataract. That's how a cataract looks and in the other eye theMoreSo in a one eye the patient is having cataract. That's how a cataract looks and in the other eye the patient is pseudo fake cake. So when the natural lens is transparent.
What is phakic and pseudophakic eyes?
It is called "phakic" (meaning "having a lens") because the eye's natural lens is left untouched. Intraocular lenses that are implanted into eyes after the eye's natural lens has been removed during cataract surgery are known as pseudophakic.
What happens when light rays pass through the cornea and lens?
As light rays pass through the cornea and lens, the rays are bent to focus them. This is called:
Where do the eyelids meet?
at the medial corner where the eyelids meet
What is the eye disorder that affects the macula?
Central vision is needed for seeing objects clearly and for common daily tasks such as reading and driving. AMD affects the macula, the central part the retina that allows the eye to see fine details. There are two forms of AMD—wet and dry.
What are the most common eye problems?
Refractive errors are the most frequent eye problems in the United States. Refractive errors include myopia (near-sightedness), hyperopia (farsightedness), astigmatism (distorted vision at all distances), and presbyopia that occurs between age 40–50 years (loss of the ability to focus up close, inability to read letters of the phone book, need to hold newspaper farther away to see clearly) can be corrected by eyeglasses, contact lenses, or in some cases surgery. The National Eye Institute states that proper refractive correction could improve vision among 150 million Americans.
What are the causes of low vision?
The leading causes of blindness and low vision in the United States are primarily age-related eye diseases such as age-related macular degeneration, cataract, diabetic retinopathy, and glaucoma. Other common eye disorders include amblyopia and strabismus. Click here to see the anatomy the eye and how the eyes work. external icon.
What is the macula of AMD?
AMD affects the macula, the central part the retina that allows the eye to see fine details. There are two forms of AMD—wet and dry. Wet AMD is when abnormal blood vessel behind the retina start to grow under the macula, ultimately leading to blood and fluid leakage.
Why do cataracts occur at any age?
Cataracts can occur at any age because of a variety of causes, and can be present at birth. Although treatment for the removal of cataract is widely available, access barriers such as insurance coverage, treatment costs, patient choice, or lack of awareness prevent many people from receiving the proper treatment.
What causes wavy lines in the eye?
Bleeding, leaking, and scarring from these blood vessels cause damage and lead to rapid central vision loss. An early symptom of wet AMD is that straight lines appear wavy. Dry AMD is when the macula thins overtime as part of aging process, gradually blurring central vision.
Why is my eye lazy?
Amblyopia is the medical term used when the vision in one of the eyes is reduced because the eye and the brain are not working together properly. The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye. Conditions leading to amblyopia include strabismus, an imbalance in the positioning of the two eyes; more nearsighted, farsighted, or astigmatic in one eye than the other eye, and rarely other eye conditions such as cataract.
What is the name of the condition where the eye has unequal refractive power?
Angle (Drainage Angle) Drainage area of the eye formed between the cornea and the iris , named for its angular shape, which is why you see the word "angle" in the different glaucoma names. Anisometropia. Condition of the eyes in which they have unequal refractive power. Anterior Chamber.
What is it called when one eye becomes dependent on the other eye to focus?
Amblyopia. Dullness or obscurity of sight for no apparent organic reason, therefore not correctable with glasses or surgery. Sometimes called a lazy eye, wherein one eye becomes dependent on the other eye to focus, usually developed in early childhood. Often associated with strabismus.
What is the name of the condition where the eye converges to a single focus point?
Aberration#N#Distortions, related to astigmatism , that cause the inability of light rays entering the eye to converge (come together) to a single focus point on the retina . Aberration are divided into two main categories: higher-order and lower-order.
What is the term for the condition where the light rays from a viewed object do not meet in?
Astigmatism . Structural defects of the eye in which the light rays from a viewed object do not meet in a single focal point, resulting in blurred images being sent to the brain. An astigmatic cornea is not perfectly rounded like a basketball but has an irregular shape more like the side of a football.
What is coating on glasses?
Coating on the front or back of glasses lenses, which minimizes the glare for patients who are extremely bothered by glare.
What is the space between the cornea and the crystalline lens?
Space between the cornea and the crystalline lens , which contains aqueous humor . Anterior ocular segment. Part of the eye anterior to the crystalline lens , including the cornea , anterior chamber , iris and ciliary body . Antioxidants.
What age can amblyopia be treated?
If amblyopia is not treated before the age of 8, the visual deficit is usually permanent. Hand held chart featuring horizontal and vertical lines, usually white on black background, used to test for central visual field defects.
What is the lens of the eye?
The lens of the eye, also called the crystalline lens, is an important part of the eye’s anatomy that allows the eye to focus on objects at varying distances. It is located behind the iris and in front of the vitreous body.
What is the condition where you can't focus on close up objects?
Presbyopia is a natural, age-related vision change that affects a person’s ability to focus on close-up objects. The condition affects almost everyone, even if they’ve never had vision problems before.
How does the lens work?
To do that, the lens uses the help of ciliary muscles to stretch and thin out when focusing on distant objects, or to shrink and thicken when focusing on near objects. When light enters the eye, the lens will bend and focus incoming light directly on the retina, which is how the clearest possible image is produced.
Why do my glasses get thicker?
The cause of presbyopia is related to alterations within the lenses’ composition. Aging triggers a change in the protein of the lenses, which causes them to thicken and become inflexible. The ciliary muscle fibers that keep the lens in place and help it change shape are also affected.
What muscles help the lens?
While the ciliary muscles allow the lens to change shape to focus, the lens itself is kept in place by little fibers that are connected to the ciliary body — these are called zonular fibers, or zonules. The ciliary body also produces aqueous humor, which keeps the lens healthy and functioning.
What is the lens that projects a focused image on the retina?
The crystalline lens projects a focused image on the retina. However, the initial image projected is inverted (either upside down or reversed). When the image is sent to the brain via the optic nerve, the brain will flip the image back to normal. The ciliary body is critical for the lens to function correctly.
What is refractive lens exchange?
RELATED READING: Refractive lens exchange (replacing the natural lenses to correct a refractive error rather than to treat cataracts)