Amy opacity of the lens of the eye
may be referred to as a cataract. However,
excluding congenital and trauma-induced
opacities, the term is most commonly
associated with the progressive internal
clouding of the lens which is seen most
often in individuals over the age of 50
years. These age-associated cataracts are
probably one of the most common types
of lens opacity (Abrahamson, 1981).
The lens is normally clear, facilitating
the free transmission of light through it. In
cataract formation the transparent gelatinous
protein of which the lens is composed,
the epithelium and the capsule in
which the lens is positioned become subject
to various damaging influences
(Cheng, 1989). This damage and the subsequent
clouding of the lens can lead to serious
visual impairment, especially when the
normal passage of light to the retina is
impeded and scattered, e.g. in cases wherecataracts are advanced and/or occur in the
middle portion of the lens (nuclear
cataract).
Amy opacity of the lens of the eye
may be referred to as a cataract. However,
excluding congenital and trauma-induced
opacities, the term is most commonly
associated with the progressive internal
clouding of the lens which is seen most
often in individuals over the age of 50
years. These age-associated cataracts are
probably one of the most common types
of lens opacity (Abrahamson, 1981).
The lens is normally clear, facilitating
the free transmission of light through it. In
cataract formation the transparent gelatinous
protein of which the lens is composed,
the epithelium and the capsule in
which the lens is positioned become subject
to various damaging influences
(Cheng, 1989). This damage and the subsequent
clouding of the lens can lead to serious
visual impairment, especially when the
normal passage of light to the retina is
impeded and scattered, e.g. in cases wherecataracts are advanced and/or occur in the
middle portion of the lens (nuclear
cataract).
การแปล กรุณารอสักครู่..