**Core Concept**
Stargardt's disease is the most common cause of inherited juvenile macular degeneration, characterized by progressive loss of central vision due to photoreceptor degeneration in the macula. It typically affects children and young adults with no obvious family history, making genetic testing challenging.

**Why the Correct Answer is Right**
Stargardt's disease is a result of mutations in the ABCA4 gene, which encodes a transmembrane transporter crucial for the efflux of retinal lipofuscin. The accumulation of lipofuscin in the retinal pigment epithelium (RPE) leads to photoreceptor degeneration. The normal ERG and EOG results in this patient suggest that the peripheral retina is largely unaffected, consistent with the focal nature of Stargardt's disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Best's Vitelliform Dystrophy is a distinct macular disorder characterized by a characteristic "egg-yolk" appearance on fundoscopy, which is not mentioned in the patient's presentation.

**Option B:** Best's Vitelliform Dystrophy typically presents in later adulthood, often with a family history, which does not match the patient's profile.

**Option C:** Retinitis Pigmentosa is a group of inherited disorders primarily affecting the peripheral retina, leading to night blindness and progressive peripheral vision loss. The normal ERG and EOG results make this diagnosis unlikely.

**Option D:** Cone-Rod Dystrophy is a progressive disorder primarily affecting cone photoreceptors, leading to central vision loss and often accompanied by color vision defects. However, the normal ERG and EOG results in this patient do not support this diagnosis.

**Clinical Pearl / High-Yield Fact**
Stargardt's disease is often referred to as "juvenile macular degeneration" due to its typical presentation in young patients. This condition highlights the importance of early ophthalmological evaluation in children with central vision loss.

**✓ Correct Answer: A. Stargardt's disease**