Soft CL
Soft contact lens
How many years can I put on contact lens?
Apr 17th
How many years can I put on contact lens?
Less than 10 years. If you wear more than this period, contact lens would hurt your ocular surface enviroment, such as lacrimal film, cornea, allergy. So you would always feel itch, red eye, dry eye, blur vision, excretion increase and lacrimation etc. Sometimes you might feel normal even though the contact lens have do harm to you, this is because it would decrease your sensation of your eyes. If you appear those clinical manifestation, go to your ophthalmologist for a advise.
What are circle lenses and are they safe?
Mar 23rd
What are circle lenses and are they safe?
Circle lens are cosmetics contact lens for beautify and could correct myopia, astigmatism and hyperopia. The diameter of the lens is on average of 14 mm(common iris diameter is 12mm) and the ratio between the optic zone and color zone is different. The color zone is always bigger than the optic zone so that your eyes appear bigger & shinier than others. And there are many color types for you to choose. Common brands are Bescon, Dueba, Geo, Neo and Jonson&Jonson.
Circle contact lenses are common seen in East Asian nations such as South Korea, Japan, and Hong kong and TW. Currently this product could be purchased online in western nations.
Circle contact lenses would not hurt your vision and cornea as long as the ones that properly match your prescription and the right base curve. As those regular contact lenses, they would affect your cornea and tear membrane stability that make you feel dry eye if you wear too long a day. Corneal limbus neovascularization will appear after years later, generally in 3 years. You should not wear contact lens for over ten years. But rigid gas permeable lens are exceptional. Allergic phenomenons are commonly seen.
If you never had contacts before, get someone to show you how to insert, remove, and take care of them. And you might want to start by only wearing for a couple hours or so at first and gradually increase to the whole day.
However, some companies sell circle lenses with bad quality to customers, even some of them without bearing the stamp of approval from health services.
What problems are associated with color blindness?
Mar 18th
What problems are associated with color blindness?
Normal color vision requires healthy function of the macula and optic nerve. The most abnormality is red-green color blindness that happens in 8% of male patients. This is X-linked congenital deficiency of one specific type of retinal photoreceptor. Depressed color vision may also be a sensitive indicator of certain kinds of macular or optic disease. For example, if a person was punched by a fist, he or she would feel color abnormality that could be judged by color blindness test book. The other examples are optic neuritis or optic nerve compression or tumor. Ishihara or Hardy-Rand-Rittler are the common testing technique. FM-100 is the advanced test technique.
If you or your family are color blindness, the first problem is you could not distinguish traffic lights and sometimes cause danger. And you would live in a colorless world. When you browse a webpage, you would find most of the page are very ugly in fact they are very beautiful. Color blindness would cause a lot of problems. One way to figure out the problem is to wear a kind of achromatopia contact lens to promote this dysfunction. But this could not cure blindness. You could tell people right or left is brighter to instead red or green.
Parents: Why my child sees blur?
Feb 27th
Parents: Why my child sees blur?
First you should tell how long, which eye, simultaneous symptom such as eye pain, red eye etc. to doctor about your child’s complain. After excluded congenital cataract, glaucoma, fundus abnormalities and nervous disease, the most common reason for it are optometric problems, such as myopia, hyperopia and astigmatism, sometimes keratoconus.
Follow the instructions according to your child’s age:
Myopia
1. 0~2 years old. Recommend using powerful cycloplegica, then exam the refractive status carefully. If there is no existed strabismus or high myopia, it is no necessary to prescribe glass wear, just observe. If high myopia, it is necessary to correct partial myopia.
2. 3~6 years old. Also recommend using powerful cycloplegica to correct partial myopia. As to less than -1.5D, observation is the treatment. The aim of this stage is to cure and prevent amblyopia.
3. 6~18 years old. The principle of wearing glass is MPMVA(maximum plus to maximum visual acuity). You should avoid accommodation of the eyes when in optometry. Avoid overcorrection. Generally, the refractive error would increase -0.5D to -0.75D per year. If exceeds, go to ophthalmologist to exclude eye disease such as glaucoma or wear RGP to prevent the hyper-increase. When the refractive error diopter is less than -3.0D, just wear the glass for distant seeing, if more than, wear all day.
Hyperopia
1. 0~3 years old. Also recommend using powerful cycloplegica to correct partial hyperopia which is more than 5.0D. If less than 5.0D, just observe. If amblyopia and strabismus, fully correct the refractive error.
2. 3~6 years old. If with amblyopia, strabismus and high AC/A, fully correct the refractive error. Mild hyperopia need no treatment.
3. 6~18 years old. Mild hyperopia need no treatment. Prescribe glass to child with visual fatigue and tell this kind of patient for wear for distance. If with amblyopia, strabismus and high AC/A, fully correct the refractive error.
Astigmatism
1. 0~2 years old. If with high astigmatism, amblyopia and strabismus, fully correct the astigmatism. Mild astigmatism need no treatment.
2. 3~6 years old. Fully correct the astigmatism.
3. 6~18 years old. Child always like see in wryneck and squint Fully correct the astigmatism. If have adaption problem, just correct insufficiently, then add gradually to full. As to the irregular astigmatism, RGP is the preference.
March, is the Allergic Season
Feb 23rd
March, is the Allergic season
There are more and more patients with allergic symptoms in our clinical outpatient. March, a getting warm season, also a allergic season.
Allergic conjunctivitis is the most often seen in this season. Patients always feel severe itching, generalized hyperemia, moderate tearing, minimal exudation, none preauricular adenopathy, eosinophils in stained scrapings and exudates and never associated sore throat or fever.
The types are three as follows:
1. Immediate hypersensitivity reactions. Those contain hay fever conjunctivitis(pollens, grasses, animal danders,etc), vernal keratoconjunctivitis, atopic keratoconjunctivitis and giant papillary conjunctivitis which caused by wearing contact lens, especially soft contact lens and attendance.
2. Delayed hypersensitivity reactions. This consists of phylctenulosis and mild conjunctivitis secondary to contact blepharitis.
3. Autoimmune disease. This include keratoconjunctivitis sicca associated with Sjogren’s syndrome and cicatricial pemphigoid. Sjogren’s syndrome typically presents dry eye and mouth.
Clearlab soft contact lens product family
Feb 6th
PREMIUM RANGE
PRODUCT MATERIAL
Clear58® etafilcon A With innovative lens design to improve comfort
Clear55A® methalfilcon A With Aspheric Optical lens design for improved visual acuity
Clear55® methalfilcon A An innovative lens design coupled with an ionic lens material to offer better comfort
Clear38® polymacon Innovative lens design combined with a traditional material to create unparallel comfort
SUPERIOR RANGE
PRODUCT MATERIAL
clear1-day™ hioxifilcon A The first biocompatible daily lens
clearall-day™ hioxifilcon A The unique aspheric biocompatible disposable lens
clearall-dayT™ hioxifilcon A The unique toric biocompatible disposable lens(Toric lens)
Am I suitable for contact lens?
Jan 31st
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)