Glasses and Lenses
The classic way of correcting refractive errors are the glasses.
The glasses act correcting this defect and also prevents all types of accidents.
For myopia-concave lenses are used or divergent. Negative spherical
For hyperopia-convex lenses are used or convergent. Positive spherical
For astigmatism-corrected with special crystals called cylindrical.
For presbyopia-It uses the same type of lenses hyperopia.
Other types:
Bifocals
Constituted by a lens divided into two zones. One for distance vision and another for near.
Multifocal Lenses
Increasing power as the visual axis in the crystal descends covering all the necessary powers to see from far to near vision.
1. PRESBYOPIA It is a defect that arises with age. It usually occurs about 40 years. It is called eyestrain. Positive lenses normally used or bifocals.
2. ASTIGMATISM Defect resides mainly in the cornea. The cornea has curvatures. The main symptoms are vision blurred some lines more and more clear, headaches, eyestrain, sleep, hop in rows in reading. Treatment: Glasses. Contact Lenses Refractive Surgery
3. Myopia Visual impairment caused by disorder which results focus and perception of blurred images when looking into the distance. The most important symptom is blurred distance vision. Treatment:
a. Glasses.
b. Contact Lenses
c. Laser correction
d. Intraocular Surgery
4. HYPEROPIA Visual impairment caused by a disorder causing a perceived focus blur, mainly in near vision. The most important symptom is blurred near vision. Treatment today supports a multifaceted approach, presenting advantages and disadvantages: Glasses- It is a safe solution, but aesthetically less acceptable.
Some distortion of the image by the distance between the glass and the eye corrector and generates continuous dependence. Contact Lenses- Optically provide better visual quality, but like the glasses do not eliminate the dependence of its use. Contact lenses can Original complications. Correction laser- Aesthetics and optically comparable with contact lenses. New degree of freedom, but take risks during surgery. Intraocular surgery- Compensatory intraocular lens implantation with or without lens extraction. The risks are higher than laser surgery.
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