Myopia is a condition at which when the non_accommodating eye has excessive refracting power and focuses parallel light rays in front of the retina.
- Increase in the axial length of the eye ( Commonest type),which could be simple ,degenerative ,congenital.
- Increase in the refractive power of the eye, that could be due to increased curvature of the cornea /the lens or be index myopia.
- Muscular athenopia: due to screwing of eyelids to stimulate a pinhole which increases the depth of focus.
- Simple: indistinct (unclear) far vision.
- Indistinct far vision.
- Discomfort after near work.
- Musca volitans.
- Retinal symptoms as photopsia and night blindness.
- Simple: normal eye.
- Tigroid fundus.
- Apparent convergent squint.
- Large corneal diameter and deep anterior chamber.
- Blue,thin sclera and large pupil.
- Divergent squint.
- Complicated cataract_lens subluxation.
- Retinal changes( tigroid fundus – temporal crescent – chorio_retinal degeneration – macular hole – macular hemorrhage – fuch’s spot – lacquer cracks – retinal detachment)
- Vitreous degeneration ( floaters)
- Posterior staphyloma (only on high myopia)
- Concave minus glasses.
- Contact lenses.
- Corneal surgery like radial keratotomy or photorefractive excimer laser surgery (PRK or LASIK or LASEK)
- Intraocular surgery like phakic IOL or clear lens extraction and IOL implantation or clear lens extraction only