Basic Vision and Vision Problems
Glossary of terms related to basic vision and vision problems.
Pinhole Glasses
Pinhole glasses are eyeglasses with special lenses consisting of a series of tiny "pinholes."
Pinhole glasses are eyeglasses with special lenses consisting of a series of tiny "pinholes."
Peripheral Vision
Peripheral vision is the field of view that surrounds the central portion of the vision field.
Peripheral vision is the field of view that surrounds the central portion of the vision field.
RGP Contact Lenses
Rigid Gas Permeable (RGP) contact lenses are made of hard plastic that gives crisp, clear vision and corrects most vision problems.
Rigid Gas Permeable (RGP) contact lenses are made of hard plastic that gives crisp, clear vision and corrects most vision problems.
IntraLASIK
IntraLASIK is a bladeless form of LASIK eye surgery.
IntraLASIK is a bladeless form of LASIK eye surgery.
LASIK
LASIK is the most commonly performed type of laser surgery to correct vision problems.
LASIK is the most commonly performed type of laser surgery to correct vision problems.
Bifocal
Bifocals are lenses that have two focal points, one for near vision and one for distance.
Bifocals are lenses that have two focal points, one for near vision and one for distance.
Accommodation
The act of focusing that occurs when the ciliary muscle contracts. When it contracts, the eyes power increases, allowing it to focus on smaller ojbects nearby.
The act of focusing that occurs when the ciliary muscle contracts. When it contracts, the eyes power increases, allowing it to focus on smaller ojbects nearby.
Amblyopia
Amblyopia is commonly known as "lazy eye." The eye appears healthy, but visual information is not transmitted or recognized properly through the visual and neural systems.
Amblyopia is commonly known as "lazy eye." The eye appears healthy, but visual information is not transmitted or recognized properly through the visual and neural systems.
Astigmatism
A refractive error in which light rays fail to come to a single focus on the retina because of differing amounts of refraction in the various meridians of the eye.
A refractive error in which light rays fail to come to a single focus on the retina because of differing amounts of refraction in the various meridians of the eye.
Hyperopia
Hyperopia is better known as farsightedness. Patients with farsightedness generally see well at a distance, but have difficulty seeing clearly at a close range.
Hyperopia is better known as farsightedness. Patients with farsightedness generally see well at a distance, but have difficulty seeing clearly at a close range.
Presbyopia
A condition common after age 40 in which a gradual lessening of the eye's power of accommodation causes difficulty in seeing near objects. Presbyopia is usually the cause of why people need reading glasses or bifocals after the age of 40.
A condition common after age 40 in which a gradual lessening of the eye's power of accommodation causes difficulty in seeing near objects. Presbyopia is usually the cause of why people need reading glasses or bifocals after the age of 40.
Lenticular astigmatism
Astigmatism due to a defect in the curvature, position, or index of refraction of the lens.
Astigmatism due to a defect in the curvature, position, or index of refraction of the lens.
Accommodative spasm
An accommodative spasm is a condition that causes the eye muscle to accommodate or focus constantly and automatically.
An accommodative spasm is a condition that causes the eye muscle to accommodate or focus constantly and automatically.
Myopia
A refractive error commonly known as nearsightedness. In myopia, the eyeball is too long in relation to its focusing power. This causes difficulty in seeing distant objects.
A refractive error commonly known as nearsightedness. In myopia, the eyeball is too long in relation to its focusing power. This causes difficulty in seeing distant objects.
Binocular Vision
Binocular vision is the ability to use both eyes as a team.
Binocular vision is the ability to use both eyes as a team.