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P (Pachymeter to Pupil)

Pachymeter

Friday, January 15th, 2010

An instrument using ultrasound to measure the corneal thickness. During refractive surgery used to assess if the cornea is thick enough for the amonunt of sculping necessary.

Phacoemulsification

Friday, January 15th, 2010

Technique for removing the crystalline lens by means ultrasonic vibrations which breaks it into pieces small enough to be sucked out.

Photo-refractive Keratectomy (PRK)

Friday, January 15th, 2010

An excimer laser is used┬áto ablate small bits of tissue from the surface of the cornea in order to re-shape it. The re-shaped cornea will focus light entering the eye and onto the retina┬ámore accurately, thus resulting in clearer vision. (more…)

Photocoagulation

Friday, January 15th, 2010

The use of a laser to seal off tissue by preventing blood entering. Used in the treatment of cancer by depriving the tumour of nourishment. Is also used to treat a detached retina.

Photophobia

Friday, January 15th, 2010

Fear of light. Over sensitivity to light leading to discomfort often accompanied by an excessive amount of tears.

Pink Eye

Friday, January 15th, 2010

See conjunctivitis.

Posterior Capsulotomy

Friday, January 15th, 2010

A cataract operation consists of the removal of the crystalline lens situated in the front of the lens capsule leaving the rear or posterior intact. However, this can sometimes become cloudy and therefore requires the cutting of a visual pathway by means of a laser.

Presbyope

Friday, January 15th, 2010

Someone who is presbyopic.

Presbyopic

Friday, January 15th, 2010

Age related loss of reading vision due to the inability of the crystalline lens to change its shape to focus on a near object.

Ptosis

Friday, January 15th, 2010

Sagging of the upper eyelid caused by a defective muscle. Is often hereditary.

Pupil

Friday, January 15th, 2010

The black opening in the centre of the iris through which light travels to the back of the eye (retina) via the crystalline lens.