OPTICS
Principles of Refraction
- Refraction is the bending of light as it passes from one medium to another.
- The amount of bending depends on the angle of incidence and the refractive indices of the two media.
- The refractive index of a medium is a measure of how much it bends light.
Types of Refraction
- Refraction through a prism: A prism refracts light by bending it through an angle.
- Refraction through a lens: A lens refracts light by bending it through a curved surface.
- Total internal reflection: When light passes from a denser medium to a rarer medium, it is completely reflected back into the denser medium.
Accommodation
- Accommodation is the ability of the eye to focus on objects at different distances.
- The process of accommodation involves the contraction and relaxation of the ciliary muscles, which changes the shape of the lens.
- The lens becomes thicker when focusing on near objects and thinner when focusing on distant objects.
Visual Acuity
- Visual acuity is a measure of the sharpness of vision, usually expressed as a fraction (e.g., 6/6).
- It is the ability to see objects clearly at a distance of 6 meters.
- Visual acuity can be affected by various factors, including refractive errors, cataracts, and age-related macular degeneration.
Homoeopathic Therapeutic Medicines for Eye Disorders
- Calcarea Carbonica: Indicated for cataracts, glaucoma, and eye strain.
- Sulfur: Indicated for conjunctivitis, blepharitis, and eye irritations.
- Arsenicum Album: Indicated for eye infections, conjunctivitis, and eye inflammation.
- Graphites: Indicated for eye dryness, conjunctivitis, and eye irritations.
- Causticum: Indicated for eye strain, cataracts, and eye dryness.