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Astigmatism (eye) print that page

on the retina in the horizontal (sagittal) plane, but not in the vertical (tangential) plane. Astigmatism causes difficulties in seeing fine detail, and in some cases vertical lines (e.g., walls) may appear to the patient to be tilted. The astigmatic optics of the human eye can often be corrected | 2011/9/29 21:30:14

Astigmatism print that page

An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci . If an optical system with astigmatism is used to form an image of a cross , the vertical and horizontal lines will be in sharp focus at two different distances. The term | 2011/9/11 3:53:11

List of instruments used in ophthalmology print that page


Instruments used specially in Ophthalmology are as follows: [ 1 ] Contents 1 Instrument list 2 Image gallery 3 References [ edit ] Instrument list Instrument Uses Spectacles (glasses) to correct refractive errors of the eye; not invasive Contact lenses to

Optometry print that page


Like most professions, the practice of optometry education , certification , is regulated in most countries. Optometrists and optometry-related organizations interact with governmental agencies, other health care professionals, and the community to deliver eye and vision care. Contents

Laser blended vision print that page

Laser blended vision provides a range of benefits, particularly in comparison to tradition monivision solutions, such as bifocal glasses or contact lenses. The key advantage of laser blended vision is the freedom from reading glasses. Over 98% of laser blended vision patients can read normal | 2011/7/16 17:54:10

Corrective lens print that page


A corrective lens is a lens worn in front of the eye , mainly used to treat myopia , hyperopia , astigmatism , and presbyopia . Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses

Eye surgery print that page


The eye is a fragile organ, requiring extreme care before, during and after a surgical procedure. An expert eye surgeon must identify the need for specific procedure and be responsible for conducting the procedure safely. Many university programmes allow patients to specify if they want to

Contact lens print that page


A contact lens (also known simply as contacts for a pair) is a corrective , cosmetic , or therapeutic lens usually placed on the cornea of the eye . Leonardo da Vinci is credited with describing and sketching the first ideas for contact lenses in 1508, but it was more than 300 years later

LASIK print that page


laser to ablate corneal tissue for the correction of optical errors, such as myopia, hyperopia, and astigmatism , was first suggested by Stephen Trokel, MD, of the Edward S. Harkness Eye Institute, Columbia University, New York, NY. Dr. Trokel, along with Dr. Charles Munnerlyn and Terry Clapham

Myopia print that page


Myopia has been classified in various manners. [ 2 ] [ 3 ] [ 4 ] [ edit ] By cause Borish and Duke-Elder classified myopia by cause: [ 3 ] [ 4 ] Axial myopia is attributed to an increase in the eye's axial length. [ 5 ] Refractive myopia is attributed to the condition of the refractive