---
type: LearningResource
title: "Common Eye Diseases: Myopia, Hypermetropia, Astigmatism & Cataract in India 2025"
canonical: "https://www.easy2crack.com/study-materials/science/common-eye-diseases-myopia-hypermetropia-TQttdcj4"
subject: Science
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updated: null
tags: ["study-material", "notes", "science"]
---
# Common Eye Diseases: Myopia, Hypermetropia, Astigmatism & Cataract in India 2025

## Common Eye Diseases and Treatments

Ocular refractive errors and pathological conditions affect visual acuity. Understanding their causes and corrective options is crucial to ophthalmology:

## 1. Myopia (Near-Sightedness / Short-Sightedness)

- Description: A condition in which nearby objects are clearly visible, but distant objects appear blurry.
- Mechanism: Light rays focus in front of the retina rather than directly on it, typically because the eyeball is too long or the cornea has excessive curvature.
- Correction: Corrected using Concave Lenses (diverging lenses), which spread the light rays outward to shift the focal point back onto the retina.

## 2. Hypermetropia (Far-Sightedness / Long-Sightedness)

- Description: A condition in which distant objects are focused clearly, while close objects appear blurred.
- Mechanism: Light rays focus behind the retina because the eyeball is too short or the lens has insufficient bending power.
- Correction: Corrected using Convex Lenses (converging lenses), which focus the incoming light rays inward to pull the focal point forward onto the retina.

## 3. Astigmatism

- Description: A refractive error causing distorted, asymmetric, or blurred vision at all distances.
- Mechanism: The cornea or lens has irregular curvature (not perfectly spherical), preventing light rays from converging at a single focus point on the retina.
- Correction: Corrected using Cylindrical Lenses or specialized contact lenses.

## 4. Cataract

- Description: A gradual clouding of the eye's natural lens, which significantly decreases visual clarity and can lead to blindness if untreated.
- Risk Factors: Primarily aging, but compounded by diabetes, smoking, excessive UV exposure, and ocular trauma.
- Correction: Eradicated and treated via surgery, wherein the cloudy natural lens is removed and replaced with an artificial intraocular lens (IOL).

---

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