Correlation 5: CataractNote the white opacified area seen here through the cornea of the eye. The normal crystalline lens of the eye is clear to allow unobstructed vision. When the fibers that form the lens become opacified, they produce what is known as a cataract. This is a relatively common problem seen with aging. The process occurs more frequently in persons with diabetes mellitus. The cataract can be removed or a lens implant placed. Presbyopia: As persons age, the crystalline lens loses its flexibility and cannot accommodate focusing, particularly at near distances. In the fifth decade, nearly everyone experiences presbyopia. Objects must be held farther away to see clearly. Persons who never had corrective lenses will require them for viewing close objects (reading), while persons who have lenses will need bifocals. Persons with myopia may not need corrective lenses for close distances with the onset of presbyopia. |
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