<unk>  is physiological insufficiency of accommodation associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Also known as age-related farsightedness (or age-related long sight in the UK), it affects many adults over the age of 40. A common sign of<unk>  is difficulty reading small print which results in having to hold reading material farther away. Other symptoms associated can be headaches and eyestrain. Different people will have different degrees of problems. Other types of refractive errors may exist at the same time as<unk> . This condition is similar to hypermetropia or far-sightedness which starts in childhood and exhibits similar symptoms of blur in the vision for close objects.<unk>  is a normal part of the aging process. It occurs due to age related changes in lens (decreased elasticity and increased hardness) and ciliary muscle power of the eye, causing the eye to focus light behind rather than on the retina when looking at close objects. It is a type of refractive error along with nearsightedness, farsightedness, and astigmatism. Diagnosis is by an eye examination.<unk>  can be corrected using glasses, contact lenses, multifocal intraocular lenses, or LASIK (presbyLASIK) surgery. The most common treatment is glass correction using appropriate convex lens. Glasses used to correct<unk>  may be simple reading glasses, bifocals, trifocals, or progressive lens. People over 40 are at risk for developing<unk>  and all people become affected to some degree. Around 25% of people (1.8 billion globally) are currently affected.
Presbyopia
Quadrantanopia
Heterotopia 
Pseudomyopia
Nyctalopia
Cerebral polyopia
Entomopia
Ocular dysmetria