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Do You Have a Strong Glasses Prescription?

Glasses are incredibly important for individuals with high prescriptions. Without vision correction, the world would be a blur, and completing simple everyday tasks would be difficult.

Unfortunately, the higher the individual’s prescription, the more power needs to be put into the corrective lenses and the thicker and heavier the lenses will be.

Luckily, there are many tips for picking the most optimal set of glasses that will provide the best comfort. Listed below are some key factors to consider when purchasing a new pair of glasses with a high refractive error.

High Myopia (Nearsightedness or Minus Prescriptions)

The first step is often to pick a set of frames that you will enjoy wearing. Of course, color and trend are important but for high prescriptions, there are other important components to keep in mind. First of all, for minus lenses, the higher the prescription, the thicker the lenses will be at the edges.

For this reason, it is important to pick a frame that has thick enough outer edges to hold the lenses in place and also to hide some of the thickness. Avoid rimless or semi-rimless frames.

Thicker temple arms on the frames can also help to hide the thickness of the lenses. Another thing to consider is that the larger the frame, the thicker the edges will be. So, it will be optimal to pick small frame sizes rather than large frames.

It is also important to make sure that the center of the frames are close to where the individual’s eyes are in the frames. Avoid frames where the eyes are sitting too close to the center of the frame and decentered towards the nose. The frames should sit close to the face to ensure optimal clarity.

The lenses for high minus prescriptions are also very important as the weight of the lenses will make a big difference, as well as any distortion in the lenses.

The thickness of the lens can be optimized by selecting a higher refractive index, which refers to the material that is used to make the lens. The higher the index, the thinner and lighter the lens will be.

It is also important to ensure that the lens has scratch-resistant, anti-reflective, and impact-resistant coatings. An aspheric design in the lens is also helpful as it decreases distortion when viewing outside of the optical center of the lens. Most high-quality lens manufacturers will automatically incorporate this into their higher prescription lenses.

A rarely used design for very high minus powers is referred to as lenticulation. This means that the prescription is put into the center of the lens in a circular disc (“the aperture”), with a thinner lens surrounding it (“the carrier”).

This decreases the weight of the lens and thins the outer edges of the lens. Keep in mind the aesthetic of the lens may not be preferred but comfort may increase immensely.

High Hypermetropia (Farsightedness or Plus Prescriptions)

Similar to high myopes, high hypermetropes (or plus prescriptions) will also need to be careful with their frame and lens selection. The higher the prescription, the thicker the lens, although the thickness will be at the center of the lens.

When picking a frame, it is also important to select a smaller frame and ensure that the eyes are not decentered too much from the centers of the lenses.

For higher plus powers, lens selection will mainly center around ensuring that the lenses have an aspheric design. This will decrease lens weight, thickness, and distortion in the periphery.
It will also help the lenses look more cosmetically appealing. A high index would also be preferred as it will make the lenses thinner and lighter. Coatings are of course important as well to prevent chipping and improve cosmetic appeal (scratch-resistant, anti-reflective, and impact-resistant coatings). Lenticulation is also an option for plus lenses.

 

Our eye doctors at Eye Theory in Houston, TX excel in the prescription of contact lenses, glasses, and various eye diseases.  Call our optometrist at 832.831.7386 or schedule an appointment online if you would like to learn more about how we can help if you have a strong glasses prescription.  Our eye doctor, Dr. Jonathan Tsao, provides the highest quality optometry services and eye exams in the Midtown, Downtown, Museum District, and Southside Commons (Southside Place) vicinities of Houston, Texas.

What is Ocular Rosacea?

Acne rosacea is a condition in which the skin on your face looks red or flushed chronically, often being worse during episodes of a flare-up. This can also be associated with acne in various regions of the face as well as have effects on the eyes. When rosacea affects the eyes, it is referred to as ocular rosacea. Below is a quick summary of the causes, symptoms, and treatment for ocular rosacea.

 

The Cause of Ocular Rosacea

At this time, it is uncertain exactly what causes rosacea. It is hypothesized that it may be genetic or due to something in the environment. There have been speculations that it may be caused by a bacteria known as Helicobacter pylori, the same organism that is responsible for infections along the digestive tract. This bacteria could be blocking the glands on the face, thus making the skin swollen and red. The redness could also be due to swelling of the blood vessels. Women are more likely than men to have rosacea.

Flare-ups of rosacea have different causes and can vary for each person. Some triggers include sun, wind, or cold exposure, very active exercise, alcohol, spicy foods, or stress.

 

Ocular Rosacea: Signs and Symptoms

Ocular rosacea is associated with red, gritty eyes or a burning sensation. It may feel like something is stuck in the eye and causing the eyes to water. Individuals may also find that their eyelids are swollen and red and their oil glands, located within the eyelids, get clogged. This is referred to as Meibomian gland disease and can lead to recurrent development of lumps growing on the inside of the eyelid. Demodex blepharitis is also more common in patients with ocular rosacea, referring to an inflammation of the eyelid caused by mites that live at the base of the lashes. Demodex is associated with crusty dandruff at the base of the lashes.

 

Ocular Rosacea Treatment Options

At this time, there is no cure for rosacea, though there are many ways to treat the symptoms. Often the first step is to avoid the triggers that can cause flare-ups.

In order to reduce the redness and swelling, our optometrist may prescribe a steroid eye drop. Antibiotics, taken either orally or topically, can be used to treat ocular infections as well as artificial tears to keep the eyes moist. It is often advised that individuals do not use eye drops meant for reducing the look of bloodshot eyes as this can make the rosacea worse and lead to a rebound effect of more red eyes after discontinuation. Eyelid hygiene will also need to be improved with the use of lid scrubs and hot compresses. In cases where the individual also has Demodex blepharitis, tea tree oil will need to be used.

 

Our eye doctors at Eye Theory in Houston, TX excel in the prescription of contact lenses, glasses, and various eye diseases.  Call our optometrist at 832.831.7386 or schedule an appointment online if you would like to learn more about ocular rosacea.  Our eye doctor, Dr. Jonathan Tsao, provides the highest quality optometry services and eye exams in the Midtown, Downtown, Museum District, and Southside Commons (Southside Place) vicinities of Houston, Texas.

Can Smoking Affect My Eyes?

Smoking has a variety of adverse effects on the body and the eyes are no exception. It is often a risk factor for developing several diseases or exacerbates existing conditions. Here are some of the interactions that smoking has with the health of your eyes.

Smoking Worsens Macular Degeneration (ARMD)

Smoking is one of the main modifiable changes to prevent age-related macular degeneration (ARMD) development and progression. In ARMD, the nerve fiber at the back of the eye, the retina, is damaged. Specifically, this disease involves damage to the macula, the portion of the area on the retina that is responsible for your central vision. This results in loss of vision centrally and currently, there is no treatment that can reverse this disease. Various studies have shown that smokers are more likely to develop ARMD compared to non-smokers.

Smoking Can Cause Cataracts

A cataract is the clouding and yellowing of the lens within your eye. This lens is responsible for focusing light on the nerve fiber layer at the back of the eye. The clouding causes people to experience blurry vision, glare, and a dimming effect with a diminished ability to distinguish colors. The change occurs gradually and the treatment includes cataract surgery to remove and replace the lens within the eye. Smoking increases the risk of developing cataracts and increases the likelihood that surgery will be needed sooner.

 

Glaucoma

Smoking is a risk factor for developing glaucoma as well. Glaucoma involves the loss of peripheral vision due to changes to the optic nerve at the back of the eye. The optic nerve transmits information from the eye to the brain and thus damage to this area will have detrimental effects on vision.

 

Diabetic Retinopathy and Cigarettes

Diabetic retinopathy (DR) refers to damage to the back of the eye as a result of diabetes. In DR, the blood vessels at the back of the eye are damaged and are leaky. This can result in hemorrhages and can cause swelling. This can blur and distort vision, ultimately leading to blindness if left untreated. Cigarette smoke can increase the likelihood of blockages in the blood vessels and the dysfunction of the vessel walls. This can in turn increase the chance of leakage of blood or the formation of excess and weak blood vessels that can cause permanent damage to the eye.

Dry Eye Disease is Exacerbated by Smoking

Dry eye disease could easily be exacerbated by the smoke produced by cigarettes. The smoke contains many chemicals and debris that can enter the eye, irritating and drying out the tear film that lubricates the front surface of the eye. Secondhand smokers will often also be consistently affected by this and unfortunately can develop dry eye disease as well. Symptoms include irritated, red, gritty, and itchy eyes.

 

Our eye doctors at Eye Theory in Houston, TX excel in the prescription of contact lenses, glasses, and various eye diseases.  Call our optometrist at 832.831.7386 or schedule an appointment online if you would like to learn more about how smoking can affect your eyes.  Our eye doctor, Dr. Jonathan Tsao, provides the highest quality optometry services and eye exams in the Midtown, Downtown, Museum District, and Southside Commons (Southside Place) vicinities of Houston, Texas.