Best Disease / Best Vitelliform macular dystrophy (BVMD)

What are the symptoms of Best Disease?

The symptoms of Best Disease generally develop gradually and may vary in intensity. Common symptoms include:

Visual Disturbances

• Blurred or Distorted Vision – As the yellowish lesion in the macula grows, it can cause blurred or distorted central vision, making it difficult to see fine details.
• Decreased Visual Acuity – Over time, the lesion may break down, leading to atrophy of the macula and a significant decline in visual acuity.

Metamorphopsia

• Wavy or Distorted Lines – Straight lines may appear wavy or bent, which is a common symptom associated with macular disorders

Scotoma

• Central Vision Loss – Individuals may develop a central Scotoma, which is a blind spot or dark area in the center of the visual field.

Color Vision Deficiency

• Difficulty in Distinguishing Colors – Some individuals may experience challenges in color perception, particularly in distinguishing between different shades.

What causes Band Keratopathy?

Best Disease is caused by mutations in the *BEST1* gene, which provides instructions for making a protein called bestrophin-1. This protein is primarily found in the retinal pigment epithelium (RPE), a layer of cells that nourishes and supports the retina. Mutations in the *BEST1* gene disrupt the function of bestrophin-1, leading to the abnormal accumulation of lipofuscin, a yellowish pigment, in the RPE cells. This accumulation eventually forms the characteristic “egg-yolk” lesion in the macula, leading to the symptoms of Best Disease.

How is Best Disease diagnosed?

Diagnosing Best Disease involves a combination of clinical examination, imaging tests, and genetic testing:-

Ophthalmoscopy

• Fundus Examination: An ophthalmologist uses an
  ophthalmoscope to examine the retina and macula. The presence of a yellowish lesion in the macula is a hallmark sign of Best Disease.

Optical Coherence Tomography (OCT)

• Retinal Imaging – OCT provides high-resolution cross-sectional images of the retina, allowing detailed visualization of the macula and detection of abnormalities, such as the “egg-yolk” lesion or retinal thinning.

Electrooculography (EOG)

• Assessment of Retinal Function – EOG measures the electrical activity of the retina in response to light. In individuals with Best Disease, the EOG often shows a reduced Arden ratio, indicating abnormal retinal function.

Genetic Testing

• Identification of BEST1 Mutation – Genetic testing can confirm the diagnosis by detecting mutations in the *BEST1* gene. This test is particularly useful for family members who may be at risk of inheriting the condition.

What are the treatment options for Best Disease?

Currently, there is no cure for Best Disease, and treatment focuses on managing symptoms and preserving vision as much as possible:-

Observation

• Regular Monitoring – In the early stages of Best Disease, when symptoms are mild, regular eye exams and monitoring are often recommended to track the progression of the condition.
• Low Vision Aids – Vision Enhancement Tools:* As the disease progresses and vision deteriorates, low vision aids such as magnifying lenses, special glasses, or electronic devices can help individuals maximize their remaining vision.

Photodynamic Therapy (PDT)

• Treatment for Complications In cases where Best Disease leads to the development of Choroidal Neovascularization (CNV), an abnormal growth of blood vessels beneath the retina, PDT can be used to seal off these vessels and prevent further vision loss.

Anti-VEGF Injections

• Management of CNV – Anti-VEGF (vascular endothelial growth factor) injections can also be administered to inhibit the growth of abnormal blood vessels associated with CNV, a potential complication of Best Disease

Is there any ongoing research for treating Best Disease?

Research into potential treatments for Best Disease is ongoing. Gene therapy and stem cell therapy are being explored as possible ways to correct the underlying genetic defect and restore normal retinal function. Clinical trials are being conducted to evaluate the safety and effectiveness of these emerging treatments.

Can Best Disease be prevented?

Since Best Disease is a genetic disorder, it cannot be prevented. However, genetic counseling can be beneficial for families with a history of the disease:

Genetic Counseling

• Family Planning – Genetic counseling provides information about the risks of passing the disease to offspring and can help families make informed decisions about family planning.

Early Detection

• Regular Eye Exams – For individuals with a family history of Best Disease, early and regular eye exams can help detect the condition before significant vision loss occurs, allowing for timely intervention and management.

What is the outlook for someone with Best Disease?

The prognosis for Best Disease varies depending on the age of onset and the severity of the condition:-

• Early-Onset – In individuals who develop Best Disease in childhood, the condition may progress slowly over many years, with periods of stability followed by gradual vision loss. Some individuals may retain good central vision well into adulthood, while others may experience more significant visual impairment.
• Late-Onset – Individuals who develop Best Disease later in life may experience a more rapid progression of the disease, with a higher risk of developing complications such as CNV, which can lead to severe vision loss if left untreated.

Can Best Disease lead to blindness?

While Best Disease can cause significant central vision loss, it typically does not lead to complete blindness. Peripheral vision is usually preserved, allowing individuals to maintain some degree of visual function.

How does Best Disease affect daily life?

Living with Best Disease can present various challenges, particularly in tasks that require sharp central vision:-

• Difficulty with Reading and Recognizing Faces – As central vision deteriorates, reading small print and recognizing faces can become increasingly difficult. Low vision aids and assistive technology can help mitigate these challenges.
• Driving Limitations – Individuals with significant central vision loss may find it unsafe to drive, particularly in low-light conditions or at night. Some may need to give up driving altogether, which can impact independence and mobility
• Emotional Impact – The gradual loss of vision can be emotionally challenging, leading to feelings of frustration, anxiety, or depression. Support from family, friends, and counseling services can be crucial in coping with the emotional aspects of living with Best Disease.

What can individuals do to manage the Best Disease day-to-day?

• Use of Vision Aids – Incorporating low vision aids into daily life can help individuals maintain their independence and continue to perform tasks that require detailed vision.
• Regular Eye Exams – Ongoing monitoring by an ophthalmologist is essential to detect any changes in vision and address complications promptly.
• Adapting the Environment – Making changes to the home environment, such as improving lighting and using high-contrast colors, can help individuals navigate more easily and safely.

Why Choose Tender Palm Eye Hospital for Best Disease Treatment in Lucknow, India?

Tender Palm Eye Hospital, owned and operated by leading medical professionals, is renowned for attracting the most skilled ophthalmologists in the country with expertise in retinal diseases, including Best Disease (Best Vitelliform macular dystrophy), the Tender Palm Eye Hospital stands out as the premier ophthalmology center in Lucknow, India.

Equipped with cutting-edge infrastructure and advanced technology, Tender Palm ensures comprehensive and high-quality medical care for patients dealing with complex eye conditions.