The Eye Doctors at Chester County Opticians

Daniel Johnston, OD - West Chester (Paoli Pike), Downingtown/Thorndale

Dr. Johnston was raised in nearby Boothwyn, PA and attended Chichester High School before earning his Bachelor’s degree in Chemistry from Swarthmore College. He then received his Doctor of Optometry degree from The Pennsylvania College of Optometry where he received Honors in Low Vision and Pediatrics. He furthered his education and training at the Tampa VA in Tampa, FL and the Southern Vision Institute in New Orleans, LA.

Dr. Johnston provides comprehensive vision examinations with emphasis on treating ocular surface disease and complex contact lens fittings and problems. He also performs pre and post-op LASIK exams.

Dr. Johnston resides in West Chester, PA. He enjoys running in all of the nearby parks and visiting any baseball stadium when time allows.

Christina Personius, OD - Downingtown/Thorndale

Dr. Personius has been an optometrist with Chester County Opticians since 2001. She works primarily at our Downingtown location. She provides comprehensive optometric exams, prescribes glasses and contact lenses, and provides pre and post-operative care for LASIK patients.

After graduating with a biology degree from Villanova University, Dr. Personius obtained her optometric degree from the Pennsylvania College of Optometry in Philadelphia. She was also inducted into the Beta Sigma Kappa optometric honor society.

She is happily married and raising two beautiful daughters.

Justin Greczek, OD - Kennett Square, West Chester (High Street)

Dr. Greczek recently joined Chester County Opticians in 2011 after practicing in the area for 5 years. He grew up in western Pennsylvania where he received his Bachelor’s degree in Biology from Juniata College in 2002. He then received his Doctor of Optometry degree from the Pennsylvania College of Optometry in 2006.

Dr. Greczek provides comprehensive eye examinations, which includes prescribing eyeglasses and contact lenses and also treating and screening for eye diseases. He has special interests in complex contact lens fittings, which include bifocals, monovision, toric/astigmatism, and finding the most comfortable lens for each patient. Dr. Greczek resides in West Chester, and in his free time enjoys spending time with his wife and their dog, and he can frequently be found fly fishing the local streams and rivers.

Megan McConville, OD - Exton, Downingtown/Thorndale

Dr McConville was born and raised in Delaware County PA. After graduating from Penncrest High School, Dr McConville received her undergraduate degree from Virginia Polytechnical Institute and State University (Virginia Tech), and then went on to complete her education with a degree as a doctor of Optometry in 2010 from The Pennsylvania College of Optometry at Salus University.


Dr McConville recently joined Chester County opticians in 2015, after practicing for five years. She performs comprehensive eye exams including specialty contact lens fitting.


In her free time, Dr McConville enjoys spending time with her husband and daughter at the beach and walking in the nearby state park.

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