Myopia sentence example
Concave Lenses are used in the treatment of myopia or shortsight.
Patients with high myopia, greater than 6.00 diopters, have an increased risk of developing a retinal tear, hole, or detachment; a posterior staphyloma; a posterior vitreous detachment; or glaucoma.
In higher degrees, where full correction might increase the myopia by inducing a strain of the accommodation, somewhat weaker glasses should be used for near work.
However, having two myopic parents does not mean for certain that a child will develop myopia.
Fewer than ten children without myopic parents had myopia.Advertisement
George W Bush is riding on the crest of this wave of political myopia.
There are hybrid lenses for those who suffer from myopia, presbyopia, astigmatism, keratoconus, hyperopia, and more.
Miscellaneous Myopia, vaginal bleeding, swelling of the tongue, gum hypertrophy, hirsutism.
The other factor which may give rise to heterophoria changes is the potential of HMDs to induce transient myopia.
Important eye problems related to degraded visual acuity and depth perception include myopia, hyperopia, astigmatism, presbyopia, and retinal rivalry.Advertisement
Laser surgery has been used successfully to treat myopia in adults.
Perceived nearness of screen The fact that the subject ' knows ' that the visual target is close leads to instrument myopia.
Around 5 million people in the UK are short-sighted and of these, about 200,000 have what's called high-degree myopia.
In order to image mice a specially made contact lens is necessary to correct for severe myopia  .
The DS Lite seems to be a case of such geographic myopia in reverse.Advertisement
The brushing over of this fact is yet another example of historical myopia.
Presbyopia is arbitrarily said to commence at the age of forty, because it is then that the need of spectacles for reading is generally felt; but it appears later in myopia and earlier in hypermetropia.
If you have astigmatism, dry eyes, or myopia, you can most likely find a contact lens to suit you.
They are used to correct vision of those people with high amounts of myopia.
In addition, a certain segment of the population suffers from "night myopia," when lack of light can cause difficulty in focusing on distant objects.Advertisement
Have a complete eye examination so that your ophthalmologist or optometrist can rule out cataracts or night myopia.
If you have night myopia, your eye care practitioner can recommend the proper prescription lenses to correct your night vision and make night driving safer for you.
If you suffer from myopia, astigmatism, presbyopia, or some other form of refractive eye disorders, then a pinhole style of eyeglass might be right for you.
The purpose of eyeglasses and contact lenses is to correct or improve the vision of people with nearsightedness (myopia), farsightedness (hyperopia), presbyopia, and astigmatism.
Myopia, or nearsightedness, is a condition in which objects in the distance are blurred either because the eye is too long or too strong.Advertisement
There are several types of myopia, of which simple myopia is the most common.
Individuals with simple myopia have eyes that are either too long or too powerful.
Individuals with high myopia, greater than six diopters, can develop pathological changes in the retina, called degenerative myopia.
Nocturnal myopia, another type of myopia sometimes referred to as "night blindness," is blurred vision only in darkness.
Myopia can also be induced by co-existing medical problems and drug exposure.Advertisement
Myopia is less likely to develop by age 13 if a child still has at least 0.75 diopters of hyperopia at age eight.
Myopia is often observed in retinopathy of prematurity (ROP).
The myopia associated with ROP increases through age five, after which it stabilizes.
Although no gene for myopia has been isolated, heredity is believed to play a role in myopia.
This drops to at most 40 percent when only one parent is nearsighted, and for 15 percent of myopic children, neither parent has myopia.Advertisement
High myopia is especially likely to have a genetic component.
Myopia is slightly more prevalent among females than males, and among those with advanced academic training.
Myopia is more prevalent in Asian countries; as much as 70 percent of the Chinese population is nearsighted.
Congenital myopia develops because of an obstruction along the visual pathway such as cataract.
A first sign that a child might have myopia is difficulty in seeing things in the distance, such as the chalkboard.Advertisement
This stretching can continue into adulthood, increasing myopia.
Doing a lot of close work, such as playing video games and using the computer for extended periods, may increase myopia for these children.
Causes of induced myopia include cataracts and elevations of blood sugar in diagnosed or undiagnosed diabetics.
Another cause of increasing myopia is the over wearing of contact lenses.
Swelling of the cornea can occur if the eye does not have sufficient oxygen causing a transient increase in myopia.Advertisement
In the early 2000s, it has been suggested that insulin resistance, which accompanies type 2 diabetes and prediabetes, may increase myopia in children and adolescents.
Thus, if insulin levels are higher than normal, the risk of myopia may be increased.
Asthenopia or a feeling of eye strain is not common in myopia.
Myopia is the most common cause of distance blur, and since much of what a child learns comes from vision and visual cues, correction of myopia is important.
Myopia is diagnosed by determining a child's unaided vision and is confirmed objectively by the eye care practitioner with various techniques, including retinoscopy and refraction.Advertisement
The type and extent of myopia is determined by additional testing.
Dilation of the eye allows the doctor to check for complications of ROP, diabetes, or degenerative myopia.
Myopia is most commonly treated with spectacles or glasses.
Once a child is diagnosed with myopia, he or she should be examined every six months to a year, and each eye should be corrected to 20/20 at each visit.
Peripheral vision is improved with contact lenses, especially for those with high degrees of myopia or who have anisometropia.
Rigid gas permeable (RGPs) contact lenses are used to correct myopia.
The rate at which myopia increases may be slowed by RGP lenses.
These lenses, called ortho-K lenses, flatten the cornea, changing the power of the cornea over time and decreasing myopia.
This effect of ortho-K lenses is not permanent and an ortho-K lens must be worn periodically or the original myopia reappears.
For some children the development of myopia may be slowed with reading glasses or bifocals.
Refractive surgery is also used to correct myopia, but only on fully grown individuals.
The most common surgical procedure performed to correct myopia is laser in situ keratomileusis (LASIK).
Other techniques to correct myopia include photorefractive keratectomy (PRK), radial keratomy (RK), laser epithelial keratomileusis (LASEK), intraocular lens implants and intrastromal corneal rings.
Cycloplegic drugs, such as atropine, may decrease myopia, but they may hinder the child's ability to see up close.
As of 2004 pirenzepine, which has shown to decrease the rate of myopia in children without sacrificing the ability of the child to do close work, is in clinical trial.
Rarely are these pathological changes of myopia seen in children or adolescents.
For individuals who have difficulty with convergence or focusing or who are esophoric, close work may increase myopia.
Increases in myopia for these children may be slowed with bifocals and/or removal of glasses for reading and homework.
Once myopia is diagnosed, it typically increases through childhood and vision correction is needed for classroom work and for sports.
If a child is not corrected fully and continues to have blurred vision, the eye may elongate in response to blur, perpetuating the myopia.
Myopia cannot be diagnosed by school screenings or by simply reading eye chart at the pediatrician's office.
A comprehensive eye exam as given by an ophthalmologist or an optometrist is needed, if myopia is suspected.
Most cases of myopia result from changes within the eye, but the condition can be a manifestation of other more serious problems, such as cataract or diabetes.
For the child with diabetes, fluctuations in blood sugars can cause swelling of the cornea of the eye, leading to transient increases in myopia, which stabilize once the diabetes is controlled.
As the child enters school, distance vision becomes critical for learning, and children with prescriptions of at least 1.00 diopter of myopia or who have 20/40 vision or worse should be given glasses.
Since elevated levels of insulin may be associated with increased myopia; a diet low in those foods that increase insulin secretion, such as refined carbohydrates, may help decrease myopia.
In cases of myopia or short-sight owing to weakness of the internal recti muscles, the eyes in looking at a near object, instead of converging, tend to turn outwards, and so double vision results.
Some of the contacts that the company offers include contacts for individuals suffering from myopia or hyperopia, contacts for individuals suffering from presbyopia, sports tinted contact lenses, and contact lenses for therapeutic use.
These prisms may be combined with concave lenses, which correct the myopia, or, since a concave lens may be considered as composed of two prisms united at their apices, the same effect may be obtained by making the distance between the centres of the concave lenses greater than that between the centres of the pupils.