Posts tagged Astigmatism

Indications

1. Age from 16 to 38
2. Myopia or hyperopia more than 1.5D, astigmatism less than 1.5D
3. Corneal curvature arranges from 41D to 46D
4. BUTs test time more than 15 second, Schirmer test is negtive

Contraindication

1. Refractive error less than 1D
2. Health habits are not good, like smoking, dirty
3. Ocular allergy, Chronic blepharitis, Arthritis, Exophthalmos, Ptosis, Psychological factors
4. Occupational environment
5. Wearing with cautious: swimming, once failure to wear

Particularly suitable for soft contact lens

1.Need to adapt to rapid or intermittent wear
2. Comfort
3. Low refractive errors(<1.5D)
4. Can not wear RGP
5. Athletes
6. Children (such as iris defects, amblyopia treatment, Albinism, nystagmus)
7. Big blepharophimosis

Particularly suitable for rigid gass permeable contact lens(RGP)

1. Those who need good vision
2. Those who have corneal astigmatism (sphere RGP can correct astigmatism within 2.5D)
3. Irregular astigmatism (corneal, keratoconus)
4. Require higher oxygen conductivity (hyperopia, aphakia, a high degree of astigmatism)
5. Children (children’s myopia progress can be delayed)
6. Those who need to simplify the lens operation, care
7. Those who need durable lens (RGP’s average life span is 2 years)