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Title	Ocular development and axial length in the Bestrophinopathies
Abstract Nr.	P105

Purpose	To describe the relationship between the RPE and ocular development in the bestrophinopathies. The bestrophinopathies are a group of 3 diseases in which the pathogenic defect is located at the level of the RPE:Best vitelliform macular dystrophy(BVMD), autosomal dominant vitreoretinochoroidopathy(ADVIRC) and autosomal recessive bestrophinopathy(ARB).
Methods	Thirty patients with BVMD, 15 patients with ADVIRC and 8 patients with ARB, with proven BEST1 mutations, underwent a detailed ophthalmological examination, including measurement of axial length and corneal diameter. In addition, psychophysical and electrophysiological testing (ISCEV-standard ERG, PERG and EOG) was performed in the majority of cases.
Results	With a mean value of 21.8mm, the axial length is significantly shorter in both BVMD and ARB, than the normal mean value of 23.6mm. In ADVIRC patients, ocular length showed a mean value of 23.4mm, a difference that was not statistically significant. In ADVIRC, the corneal diameter is reduced with a mean value of 9.7mm. In BVMD and ARB with a mean value of respectively 10.7mm and 11.2mm, microcornea is less pronounced. Visual field defects were limited to (peri)central defects in addition to enlarged blind spots in all ADVIRC patients, and (peri)central sensitivity loss in ARB patients. Full-field flash ERGs were normal in 10/10 eyes with BVMD, abnormal in 24/30 eyes in ADVIRC and 12/16 eyes in ARB. A Lp/Dt-ratio < 150% on EOG was seen in 48/60 eyes with BVMD, and all patients with ADVIRC and ARB.
Conclusion	These results show that ocular development is abnormal in the bestrophinopathies and thus suggest that either the presence of an abnormal bestrophin protein, or the complete absence of it in the RPE, influences ocular development.

Authors 1

Last name	DE ZAEYTIJD
Initials	J
Department	UZG
City	Ghent

Authors 2

Last name	Sabbe
Initials	T
Department	UZG
City	Gent

Authors 3

Last name	De Baere
Initials	E
Department	UZG
City	Gent

Authors 4

Last name	Leroy
Initials	BP
Department	UZG
City	Gent