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Panretinal photocoagulation

Eye Care estimated about CNY 1200-2500

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Description

A laser treatment that applies scattered burns to the peripheral retina to reduce abnormal blood vessel growth, commonly used for proliferative diabetic retinopathy and other ischemic retinal conditions.

Main Uses

Primary clinical use is to treat proliferative diabetic retinopathy (PDR) by reducing retinal ischemia-driven VEGF production and inducing regression of neovascularization; also used for retinal vein occlusion with neovascularization, sickle cell retinopathy, and other ischemic retinopathies. Indicated when high-risk characteristics are present: new vessels on the disc (NVD) ≥1/4 disc area, new vessels elsewhere (NVE) with vitreous/preretinal hemorrhage, or severe non-proliferative DR with extensive capillary non-perfusion.

Normal Range

Retinal photocoagulation (panretinal photocoagulation, PRP) is a therapeutic laser procedure, not a diagnostic test with numerical values; therefore, there is no 'normal range' of quantitative measurements. Clinical success is assessed qualitatively via ophthalmoscopic evaluation: typically 1200–2000 evenly spaced, confluent but non-overlapping burns applied to the peripheral retina (excluding the macula and optic disc), with endpoint being mild whitening of the retinal pigment epithelium without charring or hemorrhage.

Low Values - Possible Causes

Insufficient laser energy delivery (e.g., due to media opacities like cataract or vitreous hemorrhage), inadequate treatment coverage (e.g., missed quadrants, subtherapeutic burn intensity), poor patient cooperation or fixation leading to incomplete application, operator inexperience or technical error (e.g., incorrect spot size, duration, or power settings), and anatomical limitations (e.g., severe neovascularization obscuring retinal view).

High Values - Possible Causes

Excessive laser power or duration causing retinal burns deeper than intended (e.g., choroidal damage or scarring), over-treatment with excessive burn density (>2000 burns or overlapping lesions), inadvertent foveal or optic disc involvement, repeated PRP sessions without adequate interval leading to cumulative thermal injury, and use of inappropriate laser parameters in eyes with thin sclera or high myopia increasing risk of perforation.

retinal photocoagulation panretinal photocoagulation diabetic retinopathy treatment laser eye surgery neovascularization therapy

estimated about CNY 1200-2500