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Very premature is a condition in which a baby is delivered between 28 and 31 weeks' gestation. Depending on how premature, how sick, and how lucky or unlucky a baby is, he can get brain problems, cerebral palsy, blindness, deafness, developmental problems, learning disabilities, severe lung diseases, infection and loss of some intestines, etc... Babies who are only moderately premature usually ...Read more
Presbyopia : Presbyopia can be treated with glasses with a bifocal, contact lens monovision, multifocal contact lenses, monovision with lens implants, multifocal lens implants, lasik for monovision, and accommodative lens implants. Other methods are in development (such as presby-lasik, corneal stromal implants, femtosecond presbyopic treatments, etc. ...Read moreSee 2 more doctor answers
Less contrast: I am guessing you mean the use of multifocal contact lenses. These consist of a series of concentric rings every other being a near or far power. Most adjust well to these but they do lower the light input for each distance which creates a diminution in the function called contrast sensitivity. This is not something too common as a problem and affects only extremes of vision. ...Read moreSee 2 more doctor answers
Age related: Presbyopia is tested for after age 40 or so. It is due to the inevitable hardening of the lens which becomes visually evident between ages 40-55 when the lens no longer is flexible. It is tested in that age group by near vision apparatus in your ophthalmologists' office however there are formulas which can be used which are reliable for power and commonly applied without testing after refraction. ...Read more
Not known: Presbyopia, due to hardening of the natural lens of the eye, occurs in all humans starting in the 40's. There are good ways of compensating for this including tricks with contact lenses and bifocal eyeglasses. Discuss help with your ophthalmolgist for this. ...Read moreSee 1 more doctor answer
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