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Why do I have both shortsightedness and longsightedness?

Eye & LASIK
DOCTOR’S ANSWER (2)

It is not possible to have both short-sightedness (myopia) and long-sightedness (hypermetropia). It is more likely that you have a combination of myopia and presbyopia (old-sight, or the inability to read near objects). This is a situation that is commonly confused by many of my patients.

Myopic patients have an eye-ball that is longer than the refractive state of the eye, and hence require a negative / concave lens in order to see clearly for distance.

Hypermetropic patients have an eye-ball that is shorter than the refractive state of the eye, and hence require a positive / convex lens in order to see clearly for distance, however many young patients are able to "accommodate" (or increase the positive power of their internal lens) in order to overcome this refractive error if they are less than +3/+4 hyperopia.

Presbyopia is a condition where the internal lens of the eye has lost its ability to accommodate / increase its convexity in order to allow you to read near text / see near objects. Presbyopia occurs to ALL patients, both myopic and hypermetropic. 

However hypermetropic patients are at an added disadvantage when they become presbyopic. They become symptomatic at a much earlier stage than myopic patients, and will need spectacle correction for distance and near. Myopic patients become symptomatic for presbyopia much later, as they continue to wear their spectacles for distance, and are able to read for near either by removing their spectacles (near-sightedness), or pushing their spectacles further down along their noses.

Hope this is helpful in clarifying your situation. For scenarios specific to your situation, you should consult your ophthalmologist!

ESG

0 67 views 26 Mar 2019

An eye cannot be myopic (shortsighted) and hyperopic (longsighted) at the same time. But an eye can be myopic and presbyopic at the same time.

Hyperopia is not the same as presbyopia. Unfortunately, a lot of people get confused and call presbyopia longsightedness, when it is not.

Presbyopia is the loss of autofocusing power of the eye as the person gets older. Since the eye cannot autofocus, the person needs a certain spectacle power for distance, and a different spectacle power for near.

Hyperopia, or real longsightedness affects people differently. Mainly, hyperopia requires the eye to put in extra effort to focus (accommodate) for any particular distance.

For young people, hyperopia is usually not an issue, they usually do not need to wear glasses and they see everything clearly since they can accommodate a lot.

But as they get older, the (auto)focusing power gets less, and they will usually need reading glasses at a younger age, and then when they get even older they will also need progressives or different glasses for distance and near.

0 58 views 26 Mar 2019
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