A hardening of the lens of the eye associated with aging, other medical conditions and certain drugs causes presbyopia, according to Mayo Clinic. People with the condition cannot focus on close-up images, as the lens is ... More » Health Conditions & Diseases

Causes of wavy vision include glaucoma or increased pressure in the eye, an eye injury, and retinal detachment, according to Healthgrades. In addition, conditions emanating from the head or other parts of the body may le... More » Health Vision

Causes of blurred vision include astigmatism, hyperopia, myopia, cataracts, presbyopia, medications, dry eyes and ocular migraines or migraine headaches, as reported by MedicineNet. Other life and medical states, such as... More » Health Pain & Symptoms
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Doctors may recommend eyeglasses, contact lenses, refractive surgery, lens implants or corneal inlays to treat presbyopia, notes Mayo Clinic. Presbyopia leads to an inability of the eyes to focus on close objects, and pa... More » Health Conditions & Diseases

Some causes of excessive sleepiness include underlying conditions such as depression and sleep disorders, the use of particular medication, drugs, alcohol or smoking, states WebMD. Lack of enough sleep, which is sometime... More » Health Conditions & Diseases

According to the Free Dictionary, senile nuclear sclerosis describes a type of cataract that is characterized by a gradual hardening of the nucleus of the lens. This type of cataract is usually brown or black in color an... More » Health Conditions & Diseases

Nuclear sclerosis is a type of cataract that mainly occurs due to the hardening and yellowing of the eye's lens. This condition is generally associated with the aging process, although it advances at a slow rate, notes V... More » Health Conditions & Diseases