1. Introduction
2. Reconstruction Error of PSF for a Single Binary Star
3. Expected Deviations and Reconstruction Error
3.1. Biases for Complex Ellipticities and Size
3.2. Ideal Reconstruction Error
3.3. Suboptimal Reconstruction Error
4. Binary Stars in the Milky Way
4.1. Characteristics of Multiple Stellar Systems
4.2. Spatial Distribution of Binaries
4.3. Synthetic Images of Single and Binary Stars
5. Results
5.1. Varying the Fraction of Binaries for Different PSF
5.2. Synthetic Space-Based PSF
5.3. Effect of the Number of Stars $N_{\star}$ in the Stack
6. Conclusions