Many of us have heard about the long-sightedness of hypermetropia, a type of refractive error or eye power. The other eye conditions are myopia and astigmatism. Hypermetropia is an abnormal eye condition wherein an abnormality results in the eye’s faulty refractive ability. As a result, the distant objects appear blurred. To correct the vision for people suffering from hypermetropia, plus lenses are prescribed by the best eye specialist doctor in India.
The reasons which cause hypermetropia
Hypermetropia is a condition that occurs because the rays of light which enter the eye meet behind the retina. Due to this, the person sees a blurred image of objects and people around. Seeing a clear image is possible only when the ray of light is focused on the retina. This happens when the eyeball is shorter than the usual shape and size. Another reason could be the inability of the part of the eyes to bend the ray of light.
Causes of hypermetropia
The causes of hypermetropia can be hereditary. Also, hypermetropia can occur due to a flat cornea which is the front-most transparent layer of the eye. Having eyeballs that are smaller from front to back is also the reason for hypermetropia. The best eye specialist doctor in India calls this condition “decreased axial length”.
The various classifications of Hypermetropia
- Significant hyperopia – This is defined as a level of hyperopia symptoms that can prompt immediate clinical attention.
- Simple hyperopia – The primary cause of simple hyperopia is decreased axial length or decreased converging power of the cornea, lens, and/or media. This condition can occur owing to the flattening of the cornea/decreased curvature, and increased thickness of the lens. Etc.
- Pathologic hyperopia- Reasons for this type of hyperopia are an atypical development, trauma, or disease of the eye. The diseases that lead to pathologic hyperopia are cataracts, microphthalmia, nanophthalmos, aniridia, etc.
The various degree of refractive index that determines hyperopia intensity
- The level of hyperopia is categorized as low if it is +2.00D or less,
- The hyperopia ranging between +2.25 and +5.00D is moderate
- High hyperopia is a condition where the refractive error is equal to or greater than +5.25D. This condition can cause blurring of the optic disk margin, which is often mistaken for papilledema. However, it can be distinguished from papilledema because the vasculature is normal in size, and the retina appears normal in the surrounding areas.
The classification of hyperopia can be also done by the role of accommodation to visual functioning.
- Facultative hyperopia is a type/intensity of hyperopia that can be subdued by accommodation
- It is not possible to subdue absolute hyperopia by accommodation.
- The intensity of total hyperopia is determined by combining facultative and absolute hyperopia.
Non-cycloplegic and cycloplegic refractions can also determine the outcome of hyperopia
- Manifest hyperopia is ascertained by non-cycloplegic refraction
- On the other hand, latent hyperopia can be determined on the basis of cycloplegic refraction. By and large, the magnitude of hyperopia is established by the sum total of Manifest and Latent hyperopia.