A
form of a lens is define as the way lenses are dispensed or prevented to
patient either by glazing it on a spectacle frame or by infusing it directly in
the eye. In other to make direct contact with the cornea without a frame.
Spectacle lenses are lenses that are glazed to the size and shape of the frame,
fit on it and ways in front of the eye
for vision correction. Spectacle lens are of various types namely the single
vision (plus and minus lens) lens produced from polymethame thycrylate (PMMA)
by inlithami.
form of a lens is define as the way lenses are dispensed or prevented to
patient either by glazing it on a spectacle frame or by infusing it directly in
the eye. In other to make direct contact with the cornea without a frame.
Spectacle lenses are lenses that are glazed to the size and shape of the frame,
fit on it and ways in front of the eye
for vision correction. Spectacle lens are of various types namely the single
vision (plus and minus lens) lens produced from polymethame thycrylate (PMMA)
by inlithami.
The
bifocal lens was produced by Benjamin Franklin 1954 for the correction of both distance and near vision, while varilux
lens was introduced by Bennard M in the year 1952 for correction of presbyopia,
a refractive error which affect adult already the age of 40yrs.
bifocal lens was produced by Benjamin Franklin 1954 for the correction of both distance and near vision, while varilux
lens was introduced by Bennard M in the year 1952 for correction of presbyopia,
a refractive error which affect adult already the age of 40yrs.
According to Inlithami Fernblour,
contact lens is defined as a piece of plass or plastic materials use for
correction, cosmetic and therapeutic purpose. Contact lens are produced based
on the functions, specifically design to increase better vision, for cosmetic
purpose making the appearance of the eye look more attractive, they are also
produced for treatment management of non-refractive disorder of the eye but are
for treatment of dry eyes, cornea edema, karatocloful, corneal ectosis. Contact
lens also serves in purpose based on the construction materials. The hard
contact lens are impermeable to chemical compounds such as oxygen that is of great value to the eye, the cause irritation which now lead to
excessive secretion.
contact lens is defined as a piece of plass or plastic materials use for
correction, cosmetic and therapeutic purpose. Contact lens are produced based
on the functions, specifically design to increase better vision, for cosmetic
purpose making the appearance of the eye look more attractive, they are also
produced for treatment management of non-refractive disorder of the eye but are
for treatment of dry eyes, cornea edema, karatocloful, corneal ectosis. Contact
lens also serves in purpose based on the construction materials. The hard
contact lens are impermeable to chemical compounds such as oxygen that is of great value to the eye, the cause irritation which now lead to
excessive secretion.
Concave and contact lenses are used
for the correction of both short sightedness and long sightedness. Also toric
lens is directly used to correct astigmatism (unegue/curvature of the cornea).
Bifocal lenses are lenses used to correct presbyopia.
for the correction of both short sightedness and long sightedness. Also toric
lens is directly used to correct astigmatism (unegue/curvature of the cornea).
Bifocal lenses are lenses used to correct presbyopia.
